Multi Select

Can not reproduce
Issue description

In some parts of the creator their is parts like - Restricted Spawn - but you can only click one at a time. It would be nice to have a multi-select if possible.

Issue comments

In the editor, there are selections such as - Restriction Biomes. In this selection, you add biomes that you don't want a block to spawn but you have to do it one at a time. It would be nice to be able to click or highlight the once you want to selected and add them all at once.

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