While we automatically choose the pen colour, sometimes this doesn't show up well on your content, or you may just love the colour pink!
Either way, don't feel that you have to choose the pen colour every time you select the tool.
Simply change the default pen colour.
Click Settings icon on the right of the whiteboard.
Click the colour you would prefer.
This changes not just the pen colour, but the default colour associated with your user. For example, your chat text and user colour.
This makes it easier for you to stand out to your students. Likewise, your students can change their colour too.