For those switches you need to have a certain tf form. One of the harder ones to find. For it you need to have completed the desert and unlocked the ability to interact with the stone monuments. There is one special stone monument in the desert that needs to be repaired by collecting all broken key parts. Hints for them can be found in the forest of beginning in the hint shop.
If you have explored the snow region you may have unlocked the owl form already. It has a bonus ability that can be learned in the dojo which allows to see hidden gliding spots.
Hope this helps and thanks for playing!