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You can set different colours for guides attached to a particular artboard and guides attached to the entire canvas.
See Preferences > Guides, Grids & Slices > Guides
Thank you for your advice !
I understood that I can change those colors.
When I click outside canvas, this blue grids disappear but it show up again when I click inside canvas.
Why does it happen ?
I want to keep grids visible like light blue grids.
You can have :
a. Canvas guides. These will appear and stay whatever artboard you have selected
b. Artboard guides. These are attached to a particular artboard and will only be visible when you have that particular artboard selected (check the layers panel).
Thank you very much for your advice.
Now everything is clear and I can research this more thanks to the word of artboard guides that I didn't know.