hwo do i grap the invisible walls after i put them there then push esc but cant grab them again how i grab them again cuz i put one in wrong spot but i cant grab it and move it plz help guys

I don't know of any default invisible textures. If you have invisible walls, they're probably custom textures. If you're referring to the sky textures, I know a lot of people often have issues with selecting these textures from time to time and I've never found a solution.

Do you mean you have made a wall and you want to delete it, but are unable to highlight it by clicking on it? is so try this.

In the 2D window, the one on the left, hold down Shift and Alt, click in the window with your mouse button and make a box by dragging the cursor until it covers the wall, it should be blue in colour, then press Delete.

If when you hit Esc they don't show up, turn off a filter. Hit F and make sure everything has a check beside it.