Work with several items at once
Tick several files and folders, then move them or send them to Trash together from the bar at the foot of the list.
Moving a dozen files one by one is slow. Tick them instead, and a bar appears at the foot of the list that moves or deletes the whole selection in one go.
Select the items
Tick the checkbox at the start of each row you want. Files and folders can be mixed. In the Grid view, the checkbox appears at the top left of a card when you point at it.

Move or delete them together
Look at the bar that appears at the foot of the list. Its left end counts what you've ticked, such as 2 selected; its right end holds the buttons.

Select Move and choose a destination, then Move here. Or select Delete, then Move to Trash to confirm.
Either way the selection clears when the job is done. To give up without doing anything, select the cross at the right-hand end of the bar.