I don’t understand… 
I was doing inverse kinematics and suddenly, after linking the guests to the control, the visualization of controls disappeared. I looked through all the menus and checkboxes, I didn’t find how to fix it, maybe someone has met with this?
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Visualization has disappeared even on the control rig of a standard character. remained only on the preview.
I found the solution! it turns out there is a hotkey T to hide and show the visualization.
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