In general, the problem really exists; I clicked on the new window and the regular one (i.e., without the mod) in sequence...

In the latest version, when configuring the Hirez.ini file,
New 'Ok' and 'Cancel' in Swap Manager = 0
we get a normal swap window as it was in SoD - when pressing Enter on the keyboard or the √ button (the 'Ok' button, located in the lower right corner of the swap window), the focus remains on the left (sending) hero. And that's good. And it should remain that way. And this should be the default option. The only addition to this option is the Esc key, with the focus remaining on the right (receiving) hero. And I ask baratorch to stick to this option as the default.

And if we want to improve it further...

1. Move the left "Ok" button closer to the right "Ok" button (almost adjacent with a small gap so as not to miss with a click; do not change the position of the right button, i.e., both in the lower right corner). ...

It is likely that moving the left 'Ok' button into the area of the right window will be problematic due to graphics issues, the overall inelegant appearance of the window, and errors/confusion when using these buttons. The left 'Ok' button can be placed parallel and symmetrically in the left part of the swap window (left hero) also in the lower right corner.

I think this option will allow you to effectively use the advantages of the new window and make it easier to get used to, especially for those who use HD-SoD and other versions alternately.

If there is a redesign, there will be no getting used to it; it's deeply ingrained. As they say, you can't straighten a hunchback. :) Another matter is additions.
By the way, I'm addressing the author: is it possible to use quick map scrolling with the keys? Although I don't even realize how much this could help... it just occurred to me.
And one more thing. I scroll through the heroes in the panel using the SHIFT key during the opponent's turn (in online mode), and everything works fine. But when my turn comes, everything returns to the way it was.