GPU preview gets disabled
In Illustrator version 26.0.2 the GPU preview is disabled when rulers are shown or you enter outline or isolation mode. This bug has been around since at least v24.
How embarrassing....

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Mati Carneiro commented
hola, Tengo el mismo problema NVIDIA GeForce RTX 3070 , cambia a vista de CPU y luego no puedo volverlo a GPU. tengo que cerrar el proyecto y volver a abrir para poder cambiarlo.
Especificaciones de la maquina.
AMD Ryzen 9 5900X
32GB RAM DDR4
WINDOW 10 -
We need more information about your machine and GPU.
I can’t reproduce this bug too, so it can be a machine-specific case. -
Lance commented
I cannot reproduce this bug.
GPU preview works for me whether I have rulers visible or not, in all view modes - normal view, outline view and isolation mode. I can switch it on and off at will with Ctrl+e.I even get GPU driver warning when starting Illustrator.