I found these instructions on a MacRumors forum and tried it and it worked:
You can try to open Finder, press Cmd shift . (it is dot, period) which reveals hidden folders and, after that, on the left side, go to main folder (usually your name) and you will se Library folder grey shaded.
You can drag it on the left side holding ALT and CMD button.
So now my library folder is on the side bar of Finder. No need to go to "Go."
Originally Posted By: plantsower
Yeah, using the shift key is fine. I rarely have to do any of that anyway, Reinstalling Sierra, etc., is way too much trouble for such a little problem. Thanks, Artie.
Originally Posted By: artie505
Originally Posted By: plantsower
Knowing that all I have to do is press "shift" is helpful though.
Reinstalling Sierra or even rerunning the 10.12.6 Combo (or upgrading to High Sierra ) will probably cure your ill.
(When I uncheck the "Show..." box in my High Sierra, "shift" doesn't work to show my library; only "option" works.)
MacBook Pro - M2, Ventura 13.6 Safari Tech Prev 17.0 Safari 16.6 Firefox 116.0.2 iPhone 7 Version 15.8
) will probably cure your ill.