Steam fractional scaling should work since their big UI update a few months ago. Try launching Steam with this environment variable: STEAM_FORCE_DESKTOPUI_SCALING=1.5
It shouldn't be a parental controls thing for IG, it just needs to be made so when you're using an in-app browser, you're using it for one reason, whatever site you clicked on. Leaving the domain ends the process or opens in another browser.
You can use Cockpit Client (from flathub) to connect with SSH.