Thanks a lot for the help
I use the latest 2.4.0 sigil
My MacOS has updated to Sequoia 15.3 (I install OpenCore-Patcher for the latest system, I'm wonder if it can cause my problem)
The Graphics cards are AMD Radeon R9 M370X 2 GB and Intel Iris Pro 1536 MB
I have checked the box: "Disable GPU Acceleration in QtWebEngine/Preview" and updated the operation system, but it still show blank.