Photoshop brush preview problem

For a more accurate understanding, please understand that Korean is written in Google Translate.

Now the problem is this.

The brush option through F5 works very well however, the problem is that the brush preview brush stroke in the top toolbar has not been applied.

To summarize
1. The brush pen pressure in the viewport works normally.
2. However, the brush preview in the upper toolbar comes out as not being applied.
3. I don't know what the solution to this is.