Do you want more squads per ship or more strikecraft per squad?

1. Find the CapitalShip_ entities and open the capital ship you want to edit.
2. Scroll to the very bottom and look for CommandPoints
3. The StartValue is the initial squadrons while the ValueIncreasePerLevel is how many extra squadrons are added per level (I believe there is no rounding, only truncation)
4. Change these values

Note: Be sure to work with txt entity files not binary ones (you may need https://forums.sinsofasolarempire.com/356807/page/1/)

In the same folder with entities (GameInfo folder) search for Squad (e.g. SquadPhaseCombat is Vasari fighter strikecraft). There will be a line that says:

baseMaxNumFighters

Increase that to whatever you desire and that will alter the number of fighters per squadron. Though be warned that the build time is per strikecraft so squadrons will take longer to build unless you also change

fighterConstructionTime

For TEC fighters you'll need to open the SquadTechCombat.entity, I simply used Vasari as an example.