You can add frames of different sizes to boards. Inside frames you can add different objects in addition to other frames.
To add a frame to the board, click the Frame icon from the toolbar, different size options are available as shown below:

Select the frame size then click on the board to add it. The frame is added as shown in the below example:

You can resize the frame by dragging its corners and edges. You can add objects to the frame by following the same steps for adding them directly to the board. A number of functions can be performed using the toolbar highlighted above:
- Change the size by clicking the size field and selecting the one you want.
- Click the Color icon to change the background color. A color selector is displayed.
- Click the Lock icon to lock the frame and prevent changing its location and properties, such as size and color. The icon changes and you can click it again to unlock the frame.
- Click the comment icon to add a comment. More information on comments is available in Comments.
- Click the three dots to select similar objects on the board, bring the selected object to the front or send it to the back, or remove the selected object. You can also rename the frame, when selected, the following window appears:

Enter the new name then click Confirm.