Window on front wall behind monitors

[Glenn Kuras]

It may not be a problem at all. The only way to know is to test the room. If there is a problem you might be able to just move the monitors a bit or use THICK absorption on stands.
Learning SBIR | Speaker Boundary Interference Response

[Akayds]

Oh hi glenn, thanks i was just a little worried.

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[DanDan]

+1 to Glenn's comments. Hi G.
Windows behind the monitor may be no problem or actually beneficial at LF.
They can act as bass traps which can reduce the modal activity and BIR.
However sometimes we need the LF reinforcement caused by a solid wall.
I reversed a client's room recently for exactly this reason. Windows behind monitors, not enough bass.
DD