Instrument highlighted track plays only

hi I have just reinstalled cubase 10.
I am now having a problem i dont remember having before

if i insert audio track they all play togther but when i inset an instrument ie serum it will only play the highlighted track unless i manually select the record button on the other tracks.

i cant find the preference that allows all tracks to play highlighted or not.

can send a video of what is happening if this helps

please check video out
h t t p s : / / w w w . dropbox . com /s / gjamjnjnxmyqw09/20210613_105924.mp4?dl=0

Hi and welcome on the forum,

Could you try in the Cubase Safe Start Mode [Disable preferences], please?