How do I make the tick in a single choice selection visible to the user?

How do I make the tick in a single choice selection visible to the user? It does not look like anything has been selected, but it IS coming through on the submission

Can you please share to us the form in question?

To clarify, when you select an option in the Single choice field, the selected option is not shown?

You may edit your single choice in your Advanced CSS editor.

Go to your Form Designer>CSS>Advanced CSS editor

This is what it looks like on the form:

(I have selected the first option!)

Similarly, this one can be seen slightly, but not very clear:

Please inject this custom CSS code to your form:

.form-radio-item:not(#foo) label:after {
    background-color: black;
    cursor: pointer;
}
.form-checkbox-item:not(#foo) label:after {
    background-color: black;
    box-shadow: 0 3px 0 0 #000000, 3px 3px 0 0 #000000, 6px 3px 0 0 #000000, 9px 3px 0 0 #000000, 8px 6px 0 0 rgba(4, 19, 13, 0.79), 10px 1px 0 0 rgba(4, 19, 13, 0.79);
    -moz-transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    transform: rotate(-45deg);
}

Guide: How-to-Inject-Custom-CSS-Codes