Here’s the CSS code needed to remove the “Last Post” for BBPress that runs under WordPress.

At least this worked for the theme “GeneratePress”, maybe it will work with other themes too.
.bbp-forum-freshness, .bbp-topic-freshness, .bbp-reply-post-date, .bbp-reply-permalink, .bbp-template-notice {
display:none;
}
li.bbp-forum-freshness, li.bbp-topic-freshness {
display: none;
}
li.bbp-forum-info, li.bbp-topic-title {
width: 65%;
}
li.bbp-forum-reply-count, li.bbp-forum-topic-count, li.bbp-topic-reply-count, li.bbp-topic-voice-count {
width: 15%;
}
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