Rehearsal marks are placed outside the music, above the staff, and at the same positions as other system-attached items so they can be seen easily.
By default, rehearsal marks are positioned above barlines and to the right of clefs or key signatures at the start of systems. Although you can input rehearsal marks at rhythmic positions within a bar in Dorico Elements, this is not common practice.
When rehearsal marks coincide with tempo changes, Dorico Elements automatically positions tempo marks to the right of rehearsal marks. Dorico Elements automatically adjusts staff spacing to ensure rehearsal marks are correctly positioned.
You can move rehearsal marks to different rhythmic positions in Write mode. They are automatically positioned to avoid collisions.
You can move rehearsal marks graphically in Engrave mode, but this does not change the rhythmic positions to which they are attached.
In Dorico Elements, rehearsal marks are categorized as system-attached items. Therefore, rehearsal marks follow your per-layout settings for the visibility and positioning of system-attached items.