Why does this happen on an iMac? See video.

[davidjacobson12]

https://youtube.com/shorts/h9I0HLSD1bw

[Ged_Traynor]

@davidjacobson12 try posting your query on the Photoshop Elements forum

[davidjacobson12]

Thank you

[Greg_S.]

I know nothing about Macs, but it looks to me like the screen is slow to refresh.  I suggest you tell us what hardware and OS you are using, and what version of Elements, so that someone with Mac experience may be better able to help you.

[davidjacobson12]