Make volume and brightness sliders stay open on macbook pro touch bar
Unfortunately, you can't achieve that without any third app.


BetterTouchTool is probably the most famous one, and let you customize your TouchBar as you like. You can try it for free for 45 days to see if it suits you.


You can see on the picture below an exemple, with the brightness slider as you want :




My TouchBar My rules is a BetterTouchTool applike but free, however it's not very user friendly...


On the default preset below, you have both the brightness and volume sliders as you want :