Good Morning Sacrn, to get to the rotation toggle: open your settings menu> next scroll down to "Home Screen"> next scroll down and tap the toggle "Rotate to landscape mode" for me it looks like this setting was change to when I rotate my Note 10+ there's a little square icon that pops up at the bottom of the display next to the nativation bar that prompted me to tap that switching my home screen to a landscape orientation. And when you want to switch it back tap that same icon at the bottom.
