The buttons to close / re-open issues should be at the bottom next to the button for adding comments. This could be an addition to its placement at the top right (which is not by itself problematic), rather than removing it from there, since having it at top and bottom seems OK - or at least for longer issues. I don't have a strong opinion about whether it should be in both places, only that it must be at the bottom.
Type: task Project: impactindexer
Fixed! The Close/Reopen issue button now appears at the bottom next to the 'Add comment' button, in addition to the top right placement. This makes it easier to close issues after reading through longer threads without scrolling back up.