First click on one or two to select. Click anywhere to deselect. Click delete to delete a sprite. Click undo to redo last step. For example, if you deleted 2 then 1 then when you press undo, itll go back to last step so it adds 2 back then 1. To undo all (Which is my recent feature) click on undo all. To see your deleted apps, click on deleted apps on the top right corner, you can see and restore the apps
