Every Tool Tab now has two sections: pinned (at the top) and scrollable (below). You can move tools between the two sections either by dragging them or by opening the tool submenu (…) and selecting the Move Tool to Pinned/Scrollable Area option. That way, you can put all the tools in the scrollable area. Alternatively, you can put all the tools in the pinned area if you prefer the old functionality.
NOTE: For scrolling sliders in Capture One 20, hold down the modifier key Alt. This behavior
can be flipped from preferences if needed, where the modifier key will scroll the tools instead (this is available only on macOS).