The primary shortcut to switch to Object Mode in Blender is Tab.
While Tab is the most common method, it's worth noting that Blender allows you to switch modes in several ways, and recent versions have introduced alternative selection methods:
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Tab Key: This is the standard and most direct shortcut. Pressing the Tab key toggles between Object Mode and the last used edit mode (e.g., Edit Mode, Sculpt Mode).
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Mode Pie Menu (Alt+Q - potentially outdated): Some older references suggest Alt+Q as a way to switch between objects while in a specific mode like Sculpt Mode, Edit Mode, etc. This allowed you to select different objects and briefly highlight them. However, the functionality associated with Alt+Q can vary based on Blender version and custom keymap configurations. Its function may have evolved to object selection within the current mode, rather than switching to Object Mode.
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Mode Selection Menu (Top Left of 3D Viewport): You can always access a dropdown menu in the top-left corner of the 3D Viewport to manually select the desired mode, including Object Mode.
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Context Menu (Right Click): Right-clicking in the 3D Viewport brings up a context menu where you can often find options to switch modes depending on the selected object and the current context.
In Summary:
The quickest and most reliable way to switch to Object Mode is by pressing the Tab key. Remember that Blender's keymaps can be customized, so if the Tab key doesn't work as expected, check your preferences.