Replace

The Replace menu can be found with the [Replace...] button in the main General Tool menu. It simply replaces all of the specified block(s) that can be found in the area with another block.

The first page of the Replace menu looks like this. Here, you can choose whether to select a certain block to replace ([Normal]), or a certain block to not replace ([Exclude]).

The next pages are simple block selection menus. On the 2nd page, you choose which block to replace (or not replace), and lastly, on the 3rd page, you choose which block to replace with. After the block has been chosen in the 3rd page, the operation will start.

keep compatibility

Seeing as this operation replaces blocks with other blocks, the [Keep] option, which normally makes the operation only replace blocks such as air or water, has no effect on it.