It seems that the window got shoved into the top left? I can still interact with the ‘Save to Roblox’ button if i click where it would be on the right.
Yesterday I encountered an issue where the viewport itself would render, also in the top left corner, on my main monitor instead of the monitor that Studio was actually located on.
Edit: Closing and reopening the Asset Manager causes it to display in the top left corner of my main monitor.