Under Profile > Edit > General, set your preferred Method to BIAB.
For each Equipment Profile, you can set the Average Efficiency.
You can also change these in the recipe editor directly, but setting them in those places first will default a new recipe to use your own numbers and method.
65% is a bit low for that method though. Be sure to research the BF article on efficiency calculations, and be sure to meticulously measure all of your volumes and losses for several batches. (do not estimate - measure.) After about 5 or so batches, you should have a good running average for efficiency that will stabilize. Also, be certain you are mashing to complete 100% conversion, not just by time. (use an iodine test if you can) The efficiency article will show why that is important. If you are inconsistent with mashing to full conversion, your efficiency will be all over the map.