The widget area block allows you to add widgets to anywhere you want on a page or post. The widgets areas are made available through the theme you are using. You can enrich the widget areas via WordPress widgets.
Widget area block: customizations within the block editing panel
The moment you select any block, a block editing panel will open up on the right-hand side. It always has three options: content, style, and advanced. The possibilities inside vary from block to block.
At the “Content” level you can select from the available widget areas.
At the “Style” level you can make background and border adjustments to the area.
At the “Advanced” level, here are the most common customizations available across the Kubio blocks: background, spacing, border and shadows, typography, transform, dividers, transition, responsive, and miscellaneous.
In the case of the widget area block, you can make changes across both the normal and hover states, as seen below.