In Microsoft 365 Word, after breaking lines, the line above it flashes

Dear Forum Members, Dear Experts,

In Microsoft 365 Word, after a line break, the line above it flashes when our Client writes a document.

Device parameters:

Device name EsztiZenbook14e

Processor Intel(R) Core(TM) Ultra 9 285H (2.90 GHz)

Installed RAM 32.0 GB (31.4 GB usable)

Graphics card Intel(R) Arc(TM) 140T GPU (16GB) (128 MB)

Storage 95 GB of 954 GB used

Manufacturer ASUSTeK COMPUTER INC.

Edition Windows 11 Home

Version 25H2

Installed on ‎21/‎04/‎2026

OS build 26200.8328

Experience Windows Feature Experience Pack 1000.26100.304.0

System type 64-bit operating system, x64-based processor

Pen and touch No pen or touch input is available for this display

Video card (Intel(R) Arc(TM) 140T GPU (16GB)) driver:

32.0.101.8724 16/04/2026

I have observed several things: if the document size is 100%, it does not, but if the document size is enlarged to 150%, it is spectacular that at the end of a line, after pressing enter, the line above it flashes spectacularly for a moment.

I updated Windows and Office. I know I probably shouldn't mention it here, but I installed a LibreOffice program just for testing. In its text editor, I have the same document, the same line of text, but after pressing enter, the line above it doesn't flash.

What else I noticed: the document is 2 pages long. The error is not visible on the first page (or halfway through the document), only on the second page as we approach the end of the document.

Thank you very much for your attention and please help me fix this error.

Have a nice day everyone,

Frank