Explorer window file path/search toolbar won't unlock

It's been this way for months, so I've rebooted many times. I wish that would fix it, but thank you for suggesting solutions.

My Explorer toolbar is locked and I can enlarge file path section and decrease the Search bar. Don't understand why you cant.
You have a exceptional computer. Is it a company computer?
Did you look at group policies (gpedit.msc)? You may have a restriction set.

Meisha said:

... I've rebooted many times. ...

yes, but did you run 'sfc /scannow' (as advised) between each reboot?

I HATE when people can't do what was posted.

Do an sfc /scannow. That may fix your issue. If not, a repair install may work. If not, you have some software or something interfering.