You can save space, especially in crowded measures, by using condensed ways to display essentially the same chords.
Δ instead of Δ7
ø instead of -7b5
o instead of o7
Even though it may make the appearance *more* crowded, it’s still good to include extended qualities (b9 for example) in the chord to improve the play along accompaniment. To aid the reader, the quality can also be added underneath using text.