I downloaded your theme and tried it on my laptop. Here is the information.
Laptop Sony Vaio
OS Windows 10 (latest build)
Font Name - Sans Normal
Font size 8
DPI varied from 100% to 175% and the theme works for 100% but for 125% onward, all the tabs are not visible. Screenshot of RT at 150%DPI (Top and bottom tabs are not visible)
At 125%, even here all the top tabs are not visible.
At 100%
Is this the information you were looking for?