[Patrick C]

I admit its a bit wierd. For simplicity I’ll just give you one method, note that many variations exist.

Lets say you want to delete columns 2 to 5:
1) Single click any cell in column 2
2) Keep shift pressed
3) Single click any cell in column 5
4) Right-click on any column number (e.g the “5” of column 5).
5) Select / click “Delete columns”