Screen spacing
As a general rule, a screen should be half as wide as the viewer is sitting away from it. For example, if your sofa is 4 metres away from the screen, the screen should be about 2 metres wide. Most manufacturers specify the correct distance in the operating instructions.
and there is a 'beamer distance screen' calculation tool. type these three words into google and you are ready to go. incl. your model.

Hello,
Espon gives the following maximum sizes:
Projection surface 30 inch - 300 inch
Projection distance wide angle/tele 2.95 m - 4.8 m ( 100 inch screen)

The best setting size, however, as Holgerfries stated in the previous comment.

P.S.: I can only recommend the beamer, have been using it for a year and would not give it up so quickly. Unless you need the 4K. :)