I am sure that sometimes a visible bulge is intentional, that is, for whatever reason, the "lady" wants viewers to know that she is really a he. On the other hand, most trans ladies prefer that the bulge be invisible.
If you wear a garment with a pleated or flouncy skirt, then hiding your boy parts is usually not a concern. Pleats and flounces hide the bulge, but nearly all other womenswear require attending to the bulge.
The ultimate solution is to have those parts surgically removed.
But if you are not ready for the ultimate solution, there are other ways and they involve tucking those parts out of sight and maintaining the tuck. There is no need to reinvent the wheel, so I point you to wikiHow's tucking instructions.
Personally, I have never used tape to maintain a tuck. For my preferred method of staying tucked, scroll down the wikiHow page to "Tucking Without Tape."
The tape-free method works as long as the garment you use to maintain the tuck is tight enough. Surprisingly, I found that a gaff performs a poor job. I bought a gaff in the last century and was unimpressed with its staying power. Maybe 21st Century gaffs are better ― I dunno.
On the other hand, I have had a lot of success staying tucked by wearing panty girdles and spandex bikini-style panties (not at the same time, and the tighter, the better).
And so it goes (and hopefully, doesn't show).
Wearing Belle De Jour.
Beautiful womanless beauty pageant participant.