Why u can't see my PF balance at epfo even I have completed 1 year in TCS?

Check PF statement in my documents under Ultimatix.TCS PF managed by trust not epfo.

How to withdraw it during your job tenure?

Because in TCS it is maintained In trust. Not at EPFO. You can check PF statement in Ultimatix.

TCS have inhouse trust so they didn't directly transfer amount on EPFO account.

You can check PF statement on My documents