Using the Post Grid Combo plugin, you can create flex. This article will help you to create a flex.
To begin, insert a “Flex Wrap” block.

Then choose a variation. For example, I choose the two columns variation.

Here, you can adjust the justify-content, align-items, flex-direction, and flex-wrap settings to your liking.

Now you can add some style to the Flex Wrapper.

Then You can click on flex items and add some style to them.
