TOPIC: Menu size dynamic

Could you make the menu width depending on the window size ?
for instance min 300px but up to 40% of the main hotspots window.
With the new v4 version it would make much sense as hotspots are on the right size of the screen

That is a good idea, but I wouldn't make it 40% of the screen. I would experiment with different fixed sizes. For example if the available hotspots width is more than 1600px, then make the menu 600px, but I wouldn't make it as big as the map.
I'll add this on the todo list.
Regards,
Daniel