Hi ffsandsbach,
1/ You can add the following CSS code to the Systems > site template styles > Ja stark - default > Tools > Custom CSS to improve the style of the off-canvas menu:
.t4-offcanvas .t4-off-canvas-body .t4-module .row {
flex-direction: column;
}
.t4-offcanvas .t4-off-canvas-body .t4-module div {
max-width: 100%;
}
.t4-offcanvas .t4-off-canvas-body .t4-module div {
max-width: 100%;
}
2/ If you want to hide the "Main menu" word, you can go to the Backend > Module > Main menu and turn off the title of the module.
3/ If you want to change the "Off-canvas" title, you can open the \language\en-GB\en-GB.tpl_ja_stark.ini file and find the "T4_OFF_CANVAS_TITLE" label.
However, if you want to remove this section, you can add the following CSS code to the Custom CSS:
.t4-offcanvas .t4-off-canvas-header a {
display: none;
}
4/ About the mobile screen, I have checked and see that the off-canvas menu was showing fine. Could you send me a screenshot for further checking?