1. First open the ps software on the computer, as shown in the figure below, and then go to the next step.

2. Secondly, after opening the software, click the brush tool on the left toolbar, and then click the brush settings above the toolbar. As shown in the figure below, and then go to the next step.

3. Then, in the pop-up brush setting window, select the Shape Dynamic tab, change the size jitter and angle jitter on the right side to pen pressure, and change the roundness jitter to pen tilt, as shown in the figure below, and then go to the next step.

4. Finally, after setting, open these two icons in the toolbar, as shown in the figure below. In this way, the problem is solved.