![Image](https://forums.factorio.com/images/ext/dfd81f4b711c5af0feb9e1fd6edce36a.png)
If you pick up one of the items from the toolbelt, then immediately go to pick up another, it'll try to put the item you're holding in the slot of the item you're picking, up, which leads to "only whatever can go in this slot". So when you're working with the toolbelt, you always have to put the current item down before picking up another one.
So the feature request is: When you pick an item off the toolbelt, if the item you're currently holding already has a matching filter in the toolbelt, put it back in that slot, instead of trying to swap it with the item you're picking up.
That way you'll be able to easily switch between different items in the tool belt in just one click.
0.12.29