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Implemented in TRichView 24.1

Horizontal lines are inserted with the 0-th paragraph style.
When RichViewActions create a new document, they create the 0-th paragraph style linked with "Normal" styletemplate.

How do you try to play video from this camera using RVMedia?
Can you give me a temporary access to this camera's stream?

TRVCamera does not support playing audio using GStreamer. But FFmpeg must work.
Make sure that RVCamera.FFMpegProperty.Audio = True.
Can you send me a link to these video files?

Try to reformat the editor not as SRichViewEdit.RichViewEdit.Format, but as SRichViewEdit.Format.

Please send me a project (as simple as possible) reproducing this problem.

I mean, this is the formula used by ScaleRichView internally.

Does your footer has height greater than 1/3 of page height?

Why do you want to do it?
ScaleRichView displays bottom margin large enough to include footer, even if PageProperty.BottomMargin is small (but the limit of 1/3 page height).
I.e.,
visible_bottom_margin = max(
PageProperty.BottomMargin,
min(PageProperty.FooterY + footer_height, PageProperty ...

It's by design.
This combobox is empty when the selected font does not exist or unavailable.

The font 'Aptos' is usually not available for non-Microsoft applications (you can check, can you see it in the font combobox?), so the font size combobox does not show suggestions for it. But the combobox ...

1) Do you want to apply the default font to new documents?
Find "Normal" item in rvActionNew.StyleTemplates, and assign it properties:
TextStyle.FontName := 'Georgia';
ValidTextProperties := ValidTextProperties + [rvfiFontName];
You can do it at designtime, or at runtime before the first execution ...

This is by design,

Your text has font "Georgia" applied on top of properties defined by its styletemplate.

When you apply a styletemplate, the results depend on the selection. If the selection contains multiple paragraphs, the styletemplate is applied only to paragraph properties. Text properties ...

This code must work:

procedure TForm1.FormCreate(Sender: TObject);
var
i: integer;
begin
i := RVEFilervActionNew1.StyleTemplates.FindByName(RVHYPERLINKSTYLETEMPLATENAME);
RVEFilervActionNew1.StyleTemplates[i].ValidTextProperties := [rvfiUnderline,rvfiColor,rvfiJump,rvfiUnderlineColor ...

There is no special method to reset StyleTemplates.

If you want to remove them in code, do it in the way shown in the topic https://www.trichview.com/help/idh_trichviewedit_changestyletemplates.html

RVStyleTmp.Units := RichViewEdit1.Style.Units;
RVStyleTmp.StyleTemplates.AssignStyleTemplates ...

I made the following test:

In the ActionTest demo, I edited rvActionNew1.StyleTemplates at design time. For "Hyperlink" item, I changed:
Color = clWindowText
UnderlineColor = clAqua
ValidTextPropertiesEditor (this is how ValidTextProperties are called in the Object Inspector) = [rvfiUnderline ...

When style templates are used, ApplyStyleTemplate(-1) does the same work as MS Word: paragraphs are formatted using "Normal" styletemplate, hyperlinks are formatted using "Hyperlink" styletemplate, all other attributes are removed.

Without styletemplates, we need to answer to additional questions ...