Some icons clearly smaller than others

[jidanni]

The icons between my red pen bars feel normal sized. The others seem shrunken.

[rnorris]

The icons on the left are internally 'GTK Stock' icons, whereas most/all of the ones between the red lines are Viking own defined icons.
For GTK Stock icons, the actual icon displayed is dynamically set according to the Desktop Theme.
For me, in using XCFE4 on Debian and Gnome on Ubuntu - the icons all seem to be the correct/equivalent size.
So I don't really know why they are different for you, or if it is anything that Viking has control over.

[jidanni]

I'm just using an ordinary Chromebook.

[rnorris]

It looks like your icon theme in use is 'Adwaita', where these stock icons seem to have excess space around them.
I don't know how/if possible to configure a Chromebook - but if you can change the icon theme to 'GNOME' or 'Tango' - then these stock icons seem to have a bigger central image.
I tend to use the 'Tango' icon theme.

[jidanni]

$ sudo aptitude install tango-icon-theme

worked, but there is no clue on what to do next, anywhere.