Caolan: still exists, just isn't presented by default. help describes this as "Inserts a floating frame into the current document. Floating frames are used in HTML documents to display the contents of another file." and "Changes the properties of the selected floating frame. Floating frames work best when they contain an html document, and when they are inserted in another html document." This is basically support for html IFrames and is a fairly obscure thing for an ordinary document.
Yes, these "floating frames" are equivalent to html IFrame's and like the documentation hints were intended for supporting html iframe import and aren't a good fit for ordinary documents so I think we should de-emphasize them in the UI. And not present them by default to the user to create traps for them to fall into.
Caolán McNamara committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/5dc84674816e5f3cad9a45b9307723de3dd25b71 tdf#155006 don't show "InsertObjectFloatingFrame" by default in menus and toolbars It will be available in 7.6.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
I see it gone in: Version: 7.6.3.1 (X86_64) / LibreOffice Community Build ID: c4af5b1259bceea6e979e6fe2435dbee7a5a87c2 CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: gtk3 Locale: en-AU (en_AU.UTF-8); UI: en-US Calc: threaded Mentioned in release notes: https://wiki.documentfoundation.org/index.php?title=ReleaseNotes%2F7.6&type=revision&diff=707868&oldid=704593