Character mesh low poly in object mode and high poly in sculpt

I used InstantMeshes to clean the high poly character 3D scan object, which had to much vertices to be practical. Now I want to adjust the muscle structure with sculpt mode, and I noticed that the

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Character mesh low poly in object mode and high poly in sculpt

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rendering - heightmap from textures and hight poly mesh to apply

mesh - How do I only select vertices which are visible from my

rendering - heightmap from textures and hight poly mesh to apply