That blog's formatting is to be desired. I'll give this a read through and 
see if I can figure out how to edit the Master Slides in LibreOffice 
Impress. Will report back with findings.

On Monday, April 12, 2021 at 9:54:52 PM UTC-5 Matt Jolly wrote:

> I did some work on this late last year: from memory you are able to use 
> any pptx (within reason, as indicated by the manual) and modify styles / 
> slide templates appropriately. Note that you need to modify Slide Masters, 
> not the slides themselves (again, from memory...)
>
> For **table styles**, however, there does not exist an interface within 
> PowerPoint to modify these at the style level. You need to manually modify 
> the XML within your template, see 
> http://www.brandwares.com/bestpractices/2015/07/xml-hacking-custom-table-styles/ 
> for more information. It *does* work, and table styles are used when tables 
> are generated within a slide, however even Microsoft's Office XML validator 
> is unable to tell you if your table styles are correct; you need to try and 
> open the document in PowerPoint and see if you get any errors.
>
> On Tuesday, April 13, 2021 at 8:13:45 AM UTC+10 predat...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
>
>> I guess I'm not seeing on the documentation where it is called out how to 
>> modify those styles? Some GitHub issues I saw said to unzip the PPTX and 
>> then look for some XML file that called out the four styles called out in 
>> the documentation. However, that didn't make sense to me. 
>>
>> Does anyone have any examples of how to successfully, and clearly 
>> explained, do this? 
>>
>> On Friday, April 9, 2021 at 11:56:19 AM UTC-5 John MacFarlane wrote:
>>
>>>
>>> Generally speaking, the only modifications that are going to work 
>>> in a reference.docx or pptx are the changes to the styles 
>>> as described in the manual. If you add images, notes, etc., 
>>> you're likely to get a corrupted file. 
>>>
>>> Phillip Dudley <predat...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes: 
>>>
>>> > I wanted to try making a PowerPoint using Pandoc and Markdown, but use 
>>> a 
>>> > template that had some images already in the template. I saw that you 
>>> can 
>>> > generate a reference document by doing: 
>>> > 
>>> > - https://pandoc.org/MANUAL.html#options-affecting-specific-writers 
>>> > 
>>> > The command: 
>>> > 
>>> > pandoc -o custom-reference.pptx --print-default-data-file 
>>> reference.pptx 
>>> > 
>>> > Then I added a background image to the first slide, saved the 
>>> > custom-reference. I then tried to build the new PPTX using 
>>> > 
>>> > #cat Makefile 
>>> > .PHONY: build 
>>> > 
>>> > build: 
>>> > pandoc \ 
>>> > --reference-doc custom-pptx-reference.pptx \ 
>>> > --output slides.pptx \ 
>>> > content.md 
>>> > 
>>> > I then get the following errors: 
>>> > 
>>> > filbot@pop-os ~/D/D/L/PPTX> make build 
>>> > pandoc \ 
>>> > --reference-doc custom-pptx-refernce.pptx \ 
>>> > --output slides.pptx \ 
>>> > content.md 
>>> > Could not find shape for Powerpoint content 
>>> > make: *** [Makefile:4: build] Error 63 
>>> > 
>>> > 
>>> > Am I misinterpreting the documentation on how to use this? 
>>> > 
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>>>
>>>
>>

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