Adjusting the layout for this modifier should be the final part of the modifier UI project for 2.90.
There are a lot of issues with the Multires UI from earlier in 2.90 before the inital change, and also plenty of issues with the current UI:
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- The unsubdivide button is the largest.
- It's not clear that apply base is related to reshape.
- The way the subdivision type affects the "Subdivide" button is very confusing.
- It's also not clear that the subdivision type doesn't affect "simple" and "linear" in the same way.
- "Levels" are at the top, but they're not necessarily the most used buttons, especially with the shortcuts in sculpt mode.
- Disorganized, arbitrary appearance.
This patch is a solution that @billreynish and I worked on. Here is an image of the modifier when it has just been added:
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And with all of the subpanels expanded (ctrl click on the header does this quickly):
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And some examples of what it might look like in different situations:
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Note that there's an empty space left for the "Delete Lower" operator that will be part of 2.90.
It's also conceivable to use labels instead of subpanels to get similar descriptions, but they end up making the layout longer, because you can't collapse any of the buttons / settings you don't use.