Click or right-click the Shading label in the upper-left corner of a viewport. The text of this label shows the current shading
style; for example, “[ Wireframe ]” or “[ Smooth + Highlights ]”.
The Shading viewport label menu lets you choose how objects are displayed in the viewport.
The controls on the Shading viewport label menu depend on whether you are using Nitrous viewports or a legacy viewport driver.