Taiob Ali shows us how you can hide the results and messages panes in Azure Data Studio:
I know CTRL+R works for the same when using SQL Server Management Studio (SSMS). That hotkey did not work in Azure Data Studio (ADS). Knowing how brilliant technologists Derik is, I realized that a standard google search will not work.
I know ADS is an open-source project. Someone might have requested this feature already.
That functionality is in there, as Taiob shows.