PDF documents have an Edit PDF toggle at the end of the toolbar. It opens a second row of annotation tools: highlight, underline, squiggly, strike out, text, free text, lines, shapes, ink, stamps, carets and file attachments. The text markup tools are enabled only while text is selected. In Edit PDF mode, hovering an annotation shows a card with its details. Polygon, polyline and ink annotations can be moved by dragging.
Typing in the command palette also matches the keyboard shortcuts shown on the right, and highlights the matching part. For example, typing ctrl+p finds Print.