Why only one Lumi window?

[DoctorMG]

Is your feature request related to a problem? Please describe.
After working a while I have a lot of material and want to compare older solutions with new ones. Same as I could do with Office programs: one window left, another one right hand side. But if I open a second file (e.g., double click) there is only the last opened file. The same happens at trying to open more than one instance: only one is kept. It seems here a kind of a "singleton pattern" is implemented. But I don't see the reason why. For me it is only blocking a very open needed comparing workflow. So I need to start with nonsense screenshots, making notes about points of changes instead of directly applying what I want.

Describe the solution you'd like
Permit/support the capability to run more unlimited instances of Lumi. Similar as with all those file-based applications (PowerPoint, Corel Draw, most Adobe tools etc.)

Describe alternatives you've considered

Additional context