Solved
Facing issue in removing border in checkbox widget
Facing issue in removing border in checkbox widget in thingworx 9.4

Facing issue in removing border in checkbox widget in thingworx 9.4

I asked one of the experts and I got a solution which should work for ThingWorx 9.4.0.
ptcs-checkbox {
--ptcs-focus-overlay--border-style: none;
}
Please give this a try in the Custome CSS tab. You will need to disable the "linting" in the editor to save the update.
Let me know how it works for you.
Pehowe
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