Don't use as a verb. Instead, use switch, turn on, or turn off with the name of the toggle or command to describe what the customer must do.

OK to use as a noun or an adjective, as in toggle key or toggle switch. A toggle turns a particular mode on or off.

When you must refer to a toggle by name, use bold formatting for the name of the toggle. Use sentence-style capitalization unless you need to match the UI. Include the word toggle if it adds needed clarity.

Use the Caps lock key to switch from typing capital letters to typing lowercase letters.
To switch between Normal, Outline, and Slide Sorter views, use the buttons on the View tab.
To make text and apps easier to see, turn on the toggle under Turn on high contrast.
To keep all applied filters, turn on the Pass all filters toggle.

See also Describing interactions with UI, Formatting text in instructions