Search, and the panels

Ctrl+G (or SPC SPC, SPC /) searches the workspace by words and, with a model, by meaning: the hits on the left, the file at the hit on the right. Enter opens it.

/ finds a word in the pane you are in; n and N find it again.

The panels open over the page, the page never moving under them:

flowchart LR
  E[SPC e, the explorer] --- P((the page))
  L[SPC l, the relations] --- P
  T[a terminal] --- P
  A[SPC g, an agent] --- P

Ctrl+h j k l (Normal mode) go from the page to a panel and back.

Every panel moves and resizes. Alt (Option on a Mac) with the left button drags it anywhere; with the right button it resizes. SPC L (Go › Arrange panel…) does both by keys: h j k l move it, H J K L resize it, Enter keeps it, Esc puts it back. It opens where you left it; Go › Reset panel layout docks them all again.

More: Reference, Chapter 3: Modal Editor and Panels, and Reference, Chapter 5: The Hybrid Search Pipeline.