reposting as zero replies: Playalong part with band backing

In Musescore 3, you could select 1 part, untick a box in the mixer window, and students could play their part with the band backing them. AWESOME FEATURE!!!
This feature has been removed in MS4 &, unless I'm wrong, the fix is very finicky , selecting every other instrument in the score one by one [try an orchestral/band score!!] and making their stave [not part] unseen.
Am I right here or has it been fixed, or is there an easier fix?