Ah yes, you’re indeed correct - multiple monitors can cause some weird behavior still. One tip though, you can go into the settings and choose which monitor Steam Big Picture will use as the primary one. If you do that, it will automatically change this setting on Windows whenever it’s running so that fullscreen games boot up into the correct screen, and you have less issues with losing mouse focus.
Ah yes, you’re indeed correct - multiple monitors can cause some weird behavior still. One tip though, you can go into the settings and choose which monitor Steam Big Picture will use as the primary one. If you do that, it will automatically change this setting on Windows whenever it’s running so that fullscreen games boot up into the correct screen, and you have less issues with losing mouse focus.