Backdrop-filter (blur) has no effect on .menu-panel, even though background transparency works

The issue is that each read notification has a separate background color, which also needs to be overridden. This should help in addition to your other changes

.user-menu .quick-access-panel .read {
  background: transparent;
}

Similarly with the search input, there’s a separate background applied there that would need to be removed:

.search-menu .search-input, .search-menu-container .search-input {
  background: transparent;
}

We have a guide that walks through making CSS changes like these that may help, Making custom CSS changes on your site

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