Missing red area in Brush Tool

[AntonioLCorreia]

While using the Brush Tool, I normaly click and hold Option+Control (at the same time on iMac) and dragging the mouse a red area was showing. It is not anymore.
How to overcome such a problem ?
Please. Thank you ! 🙂

[c.pfaffenbichler]

https://feedback.photoshop.com/conversations/photoshop/photoshop-no-red-preview-when-changing-brush-...