Metadata Window position

For years & years selecting the Metadata window button, placed the metadata window vertically on the RHS of the screen (as shown in the button logo); today, for the first time ever it opens at the bottom of the screen, which is for my task not very useful, I am unaware that a user choice exists as to where that panel opens & would appreciate guidance on how to ensure the metadata window opens as a new panel on the RHS of the screen, many thanks

Click the || or = icon next to the panel's close button to toggle between the two positions.

The correct answer, of course! It is not a button I have ever consciously activated, so once again many thanks for your continued user support