Ahoy:
I am still using Version: 4.4.7.2, so this note may be of no help.
(I am not aware of any “improvements” in later versions that would help me, and I read here of so many regressions, that I have not been tempted to “upgrade”.)
Anyway, in Version: 4.4.7.2, when you select “Insert-Text Box”, you do not immediately get a box, but only an indicator that something has changed, which might appear to you as “nothing”.
The “regular” calc arrow cursor changes to a cross, with an apparent subscript looking something like a curvey-flanged I-beam.
You can use this cursor to draw the outline of the text box, which need not conform to cell boundaries.
Anything you type within those boundaries goes not into the underlying cells, but rather into the text box. Executing a CR exits the “text-box mode”, leaving the text floating.
You cannot make any entry into the underlying cells when the text box boundary is displayed, but you can after exiting, even entering right under “box” text.
Clicking within the now-invisible boundary does not select any cell; instead it brings back the box boundary, handles, &c. The box can be manipulated in the usual ways when its boundary is displayed, including re-sizing and being dragged over pre-existing cell entries.
There is, of course, much more detail to be gleaned, but best by experimentation, not additional tortured prose.
Any help?
mxk