MIDI Import Settings Window

How do I access the MIDI Import window in MuseScore 4? When I import midi files into MuseScore 3, the window opens, allowing me to uncheck any split staves I don't want. When I open the same file in MuseScore 4, there is no midi input screen and I'm stuck with split staves that I don't want split. What can I do?!?!?
Thanks!