All this time, I was searching for a model related problem, but now I believe that you are describing a software menu access problem.

In what screen shot does the missing panel not appear? I'm not familiar with FlashPrint, but slicers are slicers and have basic functions that are common across programs.

I see in two of the shots that there is a line of buttons, one of which is print. The first one in my re-post does not have that line of buttons. Is that what you mean by missing panel?

If so, what happens if you use the menu option "Print" visible on the top line? Is there an equivalent entry to match the missing button?