Why do TIE fighters occupy so much storage space instead of folding into a denser hangar arrangement?
Short answerThere is no convincing operational reason in the discussion; folding the large panels would let a carrier store many more fighters in its finite internal volume.
NotesA viewer points out that the TIE's tall fixed panels consume more storage volume than most comparable fighters. A folding arrangement would allow many more aircraft to fit inside the same hangar. Even a very large warship has finite internal space for aircraft, maintenance access, stores, and movement lanes. Poor stowage geometry can reduce the usable strength of an air group before combat begins. Embarked aircraft and hangar architecture must be developed together.