Shift+Click adds or removes any annotation or ruler from the selection, from any tool. A multi-selection now reads cleanly on the sheet, and clicking off a markup puts the style bar away.
Shift+Click toggles an annotation or ruler in or out of the selection from Pan, Select, or an armed draw tool. It works the same on a markup's body, its badge, and its value pills. A plain click still replaces the selection. On the sole selected ring, Shift+Click still deletes a vertex or inserts one on an edge.
Markups inside a multi-selection glow instead of each wearing its own dashed box. The group frame bounds the set. A Cloud+ glows once and counts once, so a Cloud+ and a rectangle read as "2 selected", not 3.
A plain click on empty ground now clears the selection and hides the style bar with it. Before, a markup opened from the outline kept its style bar up after you clicked away.