IMHO, the flowchart symbols are not suitable for your purposes.
For graphical symbols that should contain text, text boxes, drawing
symbols or frames are suitable.
Please have a look if this article helps you:
Am 24.04.2022 um 14:52 schrieb John Kaufmann:
In years of using OO/LO (now @ 188.8.131.52), I have never been interested
in the Gallery of multimedia objects. Now I have an application for
it, and can't see how to execute a simple inclusion of a graphic
without its attached descriptive text.
Specifically: in Writer I have a 4-page booklet/pamphlet in which the
two facing inner pages have related content: The left side (page 2)
has a list of summarized thoughts (each a few lines), two of which are
expanded on the right side (page 3). To help the reader make the
connection, it seems helpful in both cases to point from the condensed
version to its expansion. The Gallery has a set of "Flow chart"
graphics, including braces and brackets designed to serve the function
of grouping a few lines and pointing to a conclusion. Unfortunately,
all come with the description "Callout" which is inserted along with
the graphic -- kind of like clip-art that includes a message "This is
clip-art" (as part of the clip-art display). This can't be right, can
it? - yet I have searched in vain (including the Help and Guides) for
how to turn off that descriptive text. What am I missing?
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