You have to discard your eyefinity setting.
Open Radeon Settings, select the eyefinity tab. There should be a discard button there. At least I hope there is.
Once you've done that, EVERYTHING will open on your main screen (display 1) only.
Or if you like your eyefinity setup to be on normally then there's Option B
If you want a game to use eyefinity, then in the Radeon Settings gaming section,
FIRST click on the game you want to have eyefinity on/off,
SECOND select profile options at the top and choose eyefinity on/off.
ASUS TUF X570 wifi, AMD Ryzen 5 5600G, ASRock 6700XT Challenger, Antec Truepower new 700w. 32GB