How to adjust the slide out for proper contact to wall

The bottom of the slide is in contact with inside wall and the top you can put your hand (laying flat) between seal and the trim around slide. How do you adjust to be more out at the top so it will seal are where can I find the information needed? This is on a hydraulic unit. Thank you.

Check the tools tab above and search the manuals for slide adjustments.

Do you have slide toppers? Could be they've shrunk a tad or were just put on too tight and it's restricting the top of the slide from extending fully. Sounds strange, but some of my slides are the same and when I got up on a ladder next to the worst one and hand flexed the slide topper roller, the top of the slide moved to the full out position. Let go of the roller, and it moved back in.

If that's the case, you will need to get the spring tension in the slide topper roller adjusted. Something I need to do next summer.