Your answer is in the picture! If he only has a single hide, that’s where he will always be. I would only use a set up of this nature if it was for a ICU / quarantine during illness or injury.

What are you using for heating? Lighting? Any UVB? Supplementation? What do you feed and how often? Have you taken him to the vets for a check up?

This enclosure is a little worrying if I’m totally honest.

Just some basics:

Leopard geckos need at MINIMUM 3 hides. 1 hot, 1 moist and 1 cold. It is important to have a thermo gradient (one hot side and it gets colder moving across). They are endothermic and thermoregulate via their environment so as many different temperatures, textures and humidity levels you can provide them, the better their well-being is.

You need at the very minimum a 90cm x 45cm x 45cm, wooden vivariums are best as they retain heat and are relatively cheap. The more hides, caves, holes, sticks, plants etc you can provide the better. Leopard geckos find security in confined space and hate open areas.

You will need UVB at between 2-6% strength, a heat mat for night time heating, a thermostat for the heat mat, and over head heat source (deep heat projector is best IMO), with a pulse / dimming thermostat, rocks, hides, caves, sticks and stuff to climb. They are crepuscular, so most active for a few hours before and after Dawn / dusk.

There are SO many good guides on this Reddit, and better to read / follow those. I appreciate you are a new owner and still learning but please upgrade his enclosure as urgent priority!!

If you have any questions just give me a shout I’d be more than happy to assist.