If you select a database to monitor and then click refresh it resets the database to all.
If you are serious about creating mysql tools you will need to make them services that can be hit from a webpage and not an app that will be installed on a windows machine. Linux/mysql admins don’t use windows servers. Monyog would be an example. There is room to make money in this space. I’m a long time SQL Server DBA and love the SQL Server tools, mysql needs them a lot more than SQL Server did
So even the auto refresh sets the database selection back to all. The tool will also not show more than 15 active processes, not very helpful if I have 70.