Hi
You can open file:
[root_folder_of_your_site]/media/t4pagebuilder/builder/css/editor.css
.gjs-block-label {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-orient: horizontal;
-webkit-box-direction: reverse;
-ms-flex-direction: row-reverse;
flex-direction: row-reverse;
-webkit-box-pack: justify;
-ms-flex-pack: justify;
justify-content: space-between;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
font-family: Roboto, Helvetica, sans-serif;
font-size: 0.75rem;
font-weight: 400;
opacity: 1;
}
at approx line 15139, change the opacity to 1 like above.