Strategy & Maps
Multi-select
You can command several of your planets at once.
Building a selection: click one of your planets and pick the Select action to add it, then repeat on more planets to keep adding. You can also Ctrl-drag (or Cmd-drag) a box over the map to select every planet you own inside it. The top-center readout shows how many are selected, and the × there clears it; clicking empty space clears it too.
Acting on the selection: click an enemy or neutral planet, or a sun, to attack it from all selected planets at once. The percentage you pick is sent from each one, and holding SPACE instead sets attack automation for the whole group. Upgrades and upgrade automation are per-planet, so open a single planet's menu for those. Suns work the same way with their own selection, and planets and suns cannot be selected at the same time.
Maps
Strategic map: when zoomed out, it recolors entities by relation (blue for you, green for allies, red for enemies), draws attack lines, and blinks any planet or sun under attack so threats are easy to spot.
Logistics map: when zoomed out, it draws your supply lines and blinks your planets that are missing automations, which helps you find gaps in your coverage.
Switch between the Default, Strategic, and Logistics maps with the toggle in the bottom-left corner while zoomed out. All three are free.