There’s been some recent work on the header scss. This is an updated version of the right alignment scss customisation that will work.
.header-search-enabled .contents {
display: flex;
justify-content: space-between;
&:before, &:after {
display: none;
}
.title {
flex: 1 1 auto;
}
.search-header {
float: right;
margin-left: 0;
margin-right: 10px;
}
.search-input {
margin-right: 0;
}
.search-context {
padding-top: 5px;
}
.results {
right: 0;
}
}