Hi, currently Krita provide 2 Expanding Spacer in the toolbar. This is enough for centering actions on one toolbar. However, Krita 5.3 added 2 new custom toolbar, so now there’s not enough Expanding Spacer if you want to center or align actions on more than one toolbar.
I suggest increasing the number of Expanding Spacer in the toolbar to 6 (2 for each toolbar) and naming them “Expanding Spacer 1-6” for easy differentiation (because if you use the same Expanding Spacer twice, it won’t work and just display “Expanding Spacer” text).
For example:
