[@primamahartanto Participant 5 years ago]

Hy You can try this…

/* BBPress Fix Topic bbp-topic-form won’t show up properly on mobile */
@media (max-width:380px) and (min-width:320px) {
	#bbpress-forums .bbp-the-content-wrapper,
	#bbpress-forums #bbp_topic_title {
		width: 100%;
	}
}