Sorry, as stated in CS341907 the zoom level is only stored when "ie_browser" (default) setting is used. It is not stored for "chromium_browser" setting.
The embedded chromium browser is much faster than the IE default, but there are several limitations (fonts scaling not remembered, no font scaling via ctrl + mouse wheel, chrome extensions not possible for single sign on etc.). As IE (and its Trident library) is on its way out the same functionality should be possible with the "chromium_browser" setting.
Please check it out. Last week it was confirmed by PTC support, that it is still not working with the newest WGM release and they had also difficulties with Creo and other customers. Thus it sounds not completely fixed. But maybe the support used the wrong version. At least for WGM v11.1 M020 CPS17 (the newest version with the currently longest support time frame as 12.0.2 (long term support version) is not out yet) it is definitely not fixed.
I just tested it with Creo 7.0.4 and it didn't store the settings.
Note that I'm getting a company config.pro loaded in, so perhaps it's not communicated where the zoom setting is stored. I've added the feedback to the case, we'll see what happens.
I just tried it out in Creo 8.0.1. The default zoom setting is back to where it used to be. It appears to me that zoom settings are saved within a session of Creo but they get reset after a reboot of Creo.