Not a bad idea. I've added it as a feature request, id# 5015.

In case you're unaware, there is at least some level of customization possible in the 2025 version:

First, you can reduce the toolbars from two rows to one, by clicking on the Up Arrow on the far left of the Song toolbar:

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The toolbars will then be moved up to a tabbed section as shown here:

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As well, you can hide groups of buttons by clicking on the title of each section - in this screenshot I've hidden the Tools, Perform, MIDI, and Markers sections:

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I work here