CybroAddons/sticky_pivot_view/static/src/css/main.css

.cb_sticky {
    position: sticky;
    top: 0;
    z-index : 10;
}

tbody tr .text-nowrap{
    background-color: white;
    left : 0;
    outline: 1px solid #dee2e6;
}

.cb_sticky tr th {
    outline: 1px solid #dee2e6;
    border: none;
    outline-offset: -1px;
    left: 0;
    background-color: white;
}
thead tr .cb_sticky_first_child{
    position: sticky;
}

tbody tr .o_pivot_header_cell_closed{
    position: sticky;
}
tbody tr .o_pivot_header_cell_opened{
    position: sticky;
}

.o-dropdown.dropdown.o_group_by_menu{
    position: relative !important;
    display: block !important;
}

th .o-dropdown.dropdown.o_group_by_menu > .o-dropdown--menu.dropdown-menu{
    position: absolute !important;
    left: 105% !important;
    top: 100% !important;
}