Once you spend those points, they are locked in. There is no "tech tree respec" button in the campaign menu.
Because the community heavily requested a respec feature, the developers added a couple of built-in ways to prevent players from losing dozens of hours to a bad tech branch: Mission Failure Respec: they are billions reset tech tree
: Research Points are a finite resource earned through mission completion and finding hidden caches. Making "suboptimal" early-game choices (e.g., ignoring Soldiers or Farms) can make late-game missions mathematically impossible on higher difficulties. Once you spend those points, they are locked in
to manually add research points to your save, allowing you to unlock the rest of the tree. Backup Save Files Once you spend those points