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Hi, Radio_Al.

Qtractor supports QSS stylesheets starting with version 0.9.39.
These allow you to customize the visual appearance to a great extent.
For cases like yours they are very useful.

I recommend you upgrade to the current version.
Here you can download a version for Ubuntu that should be compatible.
(This is the development version, but it works fine.)
https://build.opensuse.org/projects/home:rncbc/packages/qtractor/reposit...

Here is an QSS example that allows you to increase the font size and make it light grey with a black background:

#timeToolbar > QAbstractSpinBox {

color: gray;
font-family: monospace;
font-weight: bold;
font-size: 22px;
min-height: 30px;
min-width:200px;
background: black;

}

There are a few QSS themes available.
https://sourceforge.net/projects/visualthemes-qtractor/

The Greyscale theme, authored by our forum colleague @windowsrefund, is very readable. It does not have the marker buttons, but this is not a problem, because you can modify the data with the mouse and keyboard.