How to make the game window smaller(I Need Help)

[zzzyyds1]

How can I set the game resolution to lower than 640*480? I have tried some methods to make the window size lower than 640*480, but it was detected by the system and I was unable to enter the game. What startup items should I use or how to edit autoexec.cfg that can Let the game window size of Team Fortress2 be lower than 640*480

 

[zzzyyds1]

I would be very grateful if you could give me a little help

 

[nesman]

did you try this? https://help.steampowered.com/en/faqs/view/7D01-D2DD-D75E-2955
-w 640 -h 480