Nothing happens when I click [Map > Map Properties...] #3806

The Map Properties were successfully opened. The reason it looks like nothing happened is because you already had them open.

Edit: These are the Map Properties, visible in your video:

Thanks, I realized this eventually too.

But in such case it should have a "tick" icon to indicate that it's already opened:

<img width="341" alt="2" src="https://github.com/mapeditor/tiled/assets/6874031/aa35e014-400f-415a-a65e-a59cb2711fbc">

The Properties panel already has such a checkmark. Such checkmarks are generally used for things that have a binary state such as on/off, which doesn't make sense for the content of the Properties panel, which can be in many states.

The Map Properties and Tileset Properties menu items are really only there because there's no good way to "select" Maps and Tilesets for viewing in the properties panel the way you can with Tiles, Objects, Layers, etc. #3101 is about making the Map and Tileset properties easier to find, and perhaps if a good solution is found there, these menu items could be removed entirely.

An alternative solution would be to briefly flash the panel, similar to how activating already activated windows works in some programs. I don't know whether this is possible in Qt.