Thanks for the reply, Salvo.
Perhaps I’m mistaken here, but my guess is that this impact on Zoom levels was overlooked as being an inevitable consequence to moving everything to the same domain. I think this was an oversight, because dependent on user settings this materially impacts usability not simply aesthetics.
On my Chromebook, for example, an appropriate Zoom level on the Forum lead to aspects elsewhere to become “unusable”, eg, the Personal Records displayed for a completed workout, due to the stacking of some elements vertically instead of horizontally. A workaround of reducing Zoom when looking at some parts of the site, then increasing it or others, then back again, etc. soon becomes very tedious if you’re someone like me who frequently jumps from the Forum to the main site.
Your suggested workaround doesn’t seem to be an option on Chromebooks, where Users are handled differently to Profiles in vanilla Chrome.
It appears Chrome used to have a flag, zoomSettingsScope, for setting Zoom on a per-tab basis vs. domain level, but it’s no longer accessible.
I’ve looked into Chrome Extensions that could help. I’ve had the best success so far with Zoom for Google Chrome, which allows Zoom levels to be specified at web page level instead of just at domain level:
Not sure if there are any downsides to this extension, but it seems like it might be a workaround for now.