Is there a way to put the L button on project window tracks?

Is there a way to put the L button on project window tracks?
close to m s buttons

Yes, in the Track Control Settings.

Hello,

yes, via the Track Controls Setting dialog (cogwheel at the bottom of the track list).
If you want it besides the M and S buttons, please use the ‘Move up’ and ‘Move down’ buttons.

[Edit] Oops, apparently it took a few minutes to write this, haraldsson was faster.

Looks like on 7.5 there isn’t the listen option under track controls. Can you confirm please?

Well, if the option is not there, it is not there.