Hi @Kapusta , which version of KNIME are you using?
Whilst I would still agree that an auto-resizing column filter list would be better, In KNIME 5.4, the Column Filter node was given new “handles” ( a horizontal line just below the column list) so you can manually drag this to increase the size of the lists.
Hopefully this functionality will also be added in future to other similar nodes, or there will be an ability to automatically resize into the empty space.