Take PS cc 2020 as an example:
1.Check whether the "window Ink" of the driver interface is checked. If it is not checked, check it.
2.Make sure that the pressure sensitive setting of Photoshop is turned on.
3.Select the brush tool, the brush setting window will open, check "shape dynamics", and under the "control" section, select "pen pressure".
4.Turn on this computer, and open it in the C drive: Users\"computer user name"\AppData\Roaming\Adobe\Adobe Photoshop 2020\Adobe Photoshop 2020 Settings\PSUserConfig.txt, the following window will pop up, put the number "0 "To "1".
（Please note: 1.everyone’s computer user name is different. If you don’t know what your computer user name is, click the "windows" icon and then move the mouse to the person icon representing the account. If the computer user name does not pop up, please click the account person Icon, and then select "change account settings" to enter the account information page to view.
2.If you can't find the "AppDate" folder, first click "View" at the top, and then check "Hidden Items".）
5.Restart Photoshop, if there is still no pressure, go to step 6.
6.Please uninstall the driver in your computer, then restart the computer and reinstall the driver.