The 4.3 layout annoyed me, so I made some quick rules for uBo.
Released as CC0, and with no guarantees, warranties, or promises.
Put these into your uBo "My filters" section:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!! DON'T FORGET TO CHANGE chathode.church TO YOUR INSTANCE !!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! Compacts columns and removes the borders between them
cathode.church##.column:style(padding: 4px 0px !important)
cathode.church##.compose-form:style(padding: 0px !important)
cathode.church##html:style(--background-border-color: unset !important)
cathode.church##.status:style(border-bottom: 1px solid var(--dropdown-border-color) !important)
! Makes secondory Post button the same size as primary
cathode.church##.button.secondary-post-button:style(flex: 1 1 auto !important;)
! Makes the Privacy and Language dropdowns small and to the right
cathode.church##.compose-form__dropdowns:style(padding-left: 80% !important)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Adjust ^THIS^ number to match your screen size, sorry, best way I could figure this out, I hate modern web dev :P
cathode.church##.compose-form__dropdowns > div:nth-child(1):style(width: 50px !important)
cathode.church##.compose-form__dropdowns > div:nth-child(2):style(width: 50px !important)
cathode.church##.compose-form__dropdowns > div:nth-child(1) > button:nth-child(1):style(padding: 2px 14% !important)
cathode.church##.compose-form__dropdowns > div:nth-child(2) > button:nth-child(1):style(padding: 2px 15% !important)
!! Values arrived at expreimentally, no clue why it doesn't do the actual numbers!
!! Make Privacy icons COLORED so they are not as easy to miss
cathode.church##svg.icon-lock:style(color: #ffa000 !important)
cathode.church##svg.icon-globe:style(color: #1976d2 !important)
cathode.church##svg.icon-unlock:style(color: #388e3c !important)
cathode.church##svg.icon-at:style(color: #d32f2f !important)