APN configuration menu: why are some APN not selectable?

Moto G7 power, LineageOS 22.2 In the APN edition config page, there is a list of APN. The first 14 are selectable (radio button on the right). Some can be edited, some can't. The 13 below are not selectable (no radio button), all are editable. All 27 have a toggle button at the bottom to activate/deactivate. The button is greyed out in what seems to be the activate position. Questions : - How come all APN are not selectable? - How come some are not editable? I understand default ones can't be edited but I didn't add all the editable ones. - My carrier says two APN should be configured: internet and MMS. However, due to the radio button, I can only select one. Is this normal? I do have mobile data. MMS kinda work but not that good ([other question](https://android.stackexchange.com/questions/262105/)) . **Edit**: I switched to another APN (ACCESS DATA / websfr), the first of the list, not editable, and it seems everything works correctly. My questions about the APN config UI still stand. Details: - Country : France - Carriel : Prixtel/SFR - Help page : https://assistance.prixtel.com/questions/900239-configurer-internet-mms-smartphone