The first step (maybe you're already doing this) is to make sure that you're doing most of your setup and planning in a web browser on a computer. The interface is much better than on a small phone screen.
There are tons of customization settings. So many that I try not to mess with them unless absolutely necessary. And if you slide all the way to the bottom of that screen, you'll find the "Reset Settings" option, which you might want to use after playing around for a while.
For your specific issue, look for Avoid and Prefer in Settings. After you search for a charging network, you can block or lower/raise your preference for that network. So, search for Tesla and then either block or click the thumb down. If there is a network or two that you really like, do the single or double thumbs up. But just remember that once you've made those changes, ABRP will no longer be giving you what it believes is the best route.
I sometimes play with Reference Speed. Mine is usually about 107% from my driving history. If I can barely make a route, I'll sometimes drop that back to 100% to see how much wiggle room I would have if I drove the speed limit. Destination Arrival SoC and Charger Arrival SoC are two others that newbies might want to change from the default 10%.
When I'm building a trip, the first thing that I do is set departure from Home instead of My Position, then set Departure SoC to 100% and set the date/time of my departure.
You may already know this, but when you're building the trip, if you click on a charging station that is showing on the map, you can add it as a Waypoint and ABRP will have you charge there, if needed. Or, after adding it as a Waypoint, you can edit its settings and set Charging "till" and enter 80%, for example, if you want more than ABRP gives you. My final tip is to right-click the map to add either a Waypoint (somewhere where you might stop and either depart later or do some charging that ABRP doesn't know about) or a Guidpoint (a place that you want to drive through, to take a very specific route).
If you have more specifics about your planned route, someone might be able to give you more help.