Seems to me Jesus never calls the disciples back that walked away.
Did Jesus want them to leave, and that’s why he did"nt call them back and say no I’m only talking in symbols.

I find that hard to believe.
Consider this Matt 13:10And the disciples came, and said unto him, Why speakest thou unto them in parables?
11He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given.
12For whosoever hath, to him shall be given, and he shall have more abundance: but whosoever hath not, from him shall be taken away even that he hath.
13Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand.
14And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive:
15For this people’s heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes and hear with their ears, and should understand with their heart, and should be converted, and I should heal them.
16But blessed are your eyes, for they see: and your ears, for they hear.
17For verily I say unto you, That many prophets and righteous men have desired to see those things which ye see, and have not seen them; and to hear those things which ye hear, and have not heard them.
34All these things spake Jesus unto the multitude in parables; and without a parable spake he not unto them:
I think the reason you give here is one very valid reason that Jesus talked in parables. He wanted to weed out those who did not or would not accept Him in faith.
Let’s take a look at Jn6 in context
50This is the bread which cometh down from heaven, that a man may eat thereof, and not die.
51I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.
Jesus says here that He is the living bread and then that the bread that He will give is His flesh. Well, let me ask you is Jesus really bread, no of coarse not. And is His flesh bread? Well, the CC would say that that is communion. If Jesus is not actually bread and I think I can safely say that He is not. He was probably talking symbolically here. So, if He is talking symbolically about Himself being bread He probably is talking symbolically about His flesh being bread.
Ok, what does it mean then? Jn 1:1In the beginning was the Word, and the Word was with God, and the Word was God.14And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
I believe that Jesus is saying that He is the Word of God which came down from heaven and it is the Word of God that was made flesh and it is the Word of God that we are to eat that will give us eternal life. Ok, keep this principle in mind as you read through v. 58
52The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?
53Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.
54Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.
55For my flesh is meat indeed, and my blood is drink indeed.
56He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him.
57As the living Father hath sent me, and I live by the Father: so he that eateth me, even he shall live by me.
58This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever.
59These things said he in the synagogue, as he taught in Capernaum.
60Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it?
This is not the twelve, but others. He hears them murmuring and decides to call them on their lack of faith.
61When Jesus knew in himself that his disciples murmured at it, he said unto them, Doth this offend you?
62What and if ye shall see the Son of man ascend up where he was before?
He says does this offend you? What if you saw me sitting in heaven next to my Father? Would you believe me then? The implied answer is of coarse no.
63It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.
In this v. I believe Jesus confirms what I have been saying. That His words are spirit and they are life. The flesh that He talks about in this v. is the spirit of the world.
64But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who should betray him.
See Jesus knew from the beginning that These guys didn’t believe in Him. So, He saw no reason to call them back and explain it to them.
65And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father.
66From that time many of his disciples went back, and walked no more with him.
These disciples were not cooperating with the Holy Spirit that the Father had sent to them and therefore they walked no more with Him.
67Then said Jesus unto the twelve, Will ye also go away?
68Then Simon Peter answered him, Lord, to whom shall we go? thou hast the words of eternal life.
69And we believe and are sure that thou art that Christ, the Son of the living God.
Here Peter affirms what Jesus has been saying all along and that is that the WORDS of Jesus lead to eternal life.