Updated:
We fixed the issue of dropdown issue with this custom css rule:
/* Joomlart fix dropdown in Edit Profile Page */
#t4-megamenu-mainmenu {
overflow: visible;
}
.t4-edit-layout div#t4-header {
padding-top: 0;
padding-bottom: 0;
}
About the Tab key, it relates to the Accessibility standard in browser, we can fix it (not to show the off-canvas when using Tab key) but it will affect the animation of off-canvas settings, if you don't use animation for off-canvas, we will update it, pls let me know.