How do I reset the COMMENTS TOLBAR to the default setting? (Acrobat reader DC)

I need to reset the COMMENTS TOOLBAR to its default configuration.   Currently it only shows the "color picker" and the "line width selector", and not any of the other tools (sticky note, highlighter, etc).

Version is "Adobe Acrobat Reader DC" version: 2018.011.20058

Operating system is Windows 7.

Thanks,

Phil