Some notes about gas: It’s primarily caused by a combination of fiber, and in the case of beans, by the oligosaccharides. The fiber can be handled by gradually increasing intake of high fiber foods. The more you get used to eating them, the less bloated you should feel, and it generally goes down to a normal level of gas that most people experience.

For the oligosaccharides, soaking and rinsing the dry beans does help remove a lot of it. Rinsing canned beans also helps. Taking Beano (or an equivalent) can help too. There are also claims of various spices being able to help as well.

It’s also important to note that different types of legumes can cause more bloating, or less. Experiment with different kinds to find what works for you.

If you’re willing/able to make the effort, sprouting and even fermenting will significantly help with bloating as well.

As a last resort or easy reprieve, opting for low fiber plant foods like white rice and tofu won’t hurt in the short term, though whole foods should generally be preferred because natural sources of fiber of hugely beneficial.

On an unrelated note, I have always hated soaking beans, which is why the Instant Pot has been one of the single greatest cooking inventions I have ever used. Supposedly the pressure cooking also breaks down the oligosaccharides and reduces bloating. I just love it because I can toss in a bunch of beans and oat groats, and have enough of that stuff cooked to easily and quickly prepare meals every day for a week with each batch.