I am copying text into a comments block in Impress, but the block is small and the font is too small to read easily. I was not able to resize the block. I am using 7.3.2.2 (64) on Win 10. Any suggestions would be appreciated. The file was originally a pptx file but is not in odp format.
Also when I opened the file in LO, the comments from PPt were not included.
It could be a compatibility problem.
Always save your files in the native file format.
So if you work mainly with LibreOffice, always save in the Open Document Format ODF.
Basically:
Recommendation for a clean work with LibreOffice, if different Office programs are used, or foreign formats are used in LibreOffice.
Old files in foreign formats must be converted in ODF and possibly adapted.
Files created in LibreOffice are to be saved in ODF format (ODT, ODS, ODP, etc.).
Always keep these files as source.
If you need other formats to share with partners, you can open an ODF file and use ″Save as…″ (copy) to save it in another format and share it.
This way you always have working files available on your system environment.
See:
Edit different file formats in LibreOffice
Please report the behavior also as an error in Bugzilla .
See also:
How to Report Bugs in LibreOffice .
Please post the link to the bug here.
format: tdf#nnnnnn (use only the number, not the link)
To do this, edit your original question. Thank you very much.
Thanks for taking the time to respond.
In this case the file had been opened in LO and saved as a .odp file several times. My original statement should have read: The file was originally a pptx file but is NOW in odp format. Sorry for creating a confusing problem statement.
The text that I was trying to add to a comment was from a Notepad file so that it did not carry any formatting with it.
On the plus side, your comment is the most comprehensive that I have seen when searching for answers and I truly appreciate that and the inclusion of a link to bugzilla is appreciated since I can never find that.
Thanks again. and off I go to report it as a bug/feature request. 
UPDATE: While trying to document the issue for bugzilla, with the most current version of the converted file, I am unable to repeat the same situation. as comments added now are sized in an easily readable size. This copy of the file is the fourth version of the original file.