How do i go back to main campaign map?

[Jivebot]

Just did the first DLC. wanted to hunt a few more collectibles before I start the 2nd but I dont see a way to return to the old map

[gru]

Press tap, go to the dlc menu, switch back to base game.

[Lonely FireWolf]

Go to the menu, where in top bar you have Map, Gadgets, Missions etc. On the far right is DLC. Go to it and there you can choose Main game.

[CacaFresca]

I know there are technically no stupid questions, but this one comes pretty close.