Resize and collapse inbox panels

The inbox has five columns: the app rail, the views sidebar, the conversation list, the thread and the details panel. You can adjust most of them.

Resize

Drag the edge between two panels. The thread takes the remaining space and never gets narrower than 320 pixels.

Panel	Narrowest	Widest	Default
Views	180	320	220
Conversation list	260	480	320
Details	260	440	300

Use the keyboard

Focus an edge with Tab. Press the left or right arrow to move it 16 pixels at a time. Double-click an edge to reset it to the default.

Collapse

The list icon in the thread header hides the views sidebar. The panel icon hides the details panel. Both buttons report whether they are expanded to screen readers.

Small screens

Below 960 pixels wide only the conversation list shows. Opening a conversation takes you to the thread at full width, with a back button to return to the list.