Calibre Default Conversion Options

[captainsensible]

I am trying to set the following as the default conversion options for EPUB conversion:

Spoiler:

output_profile: 'tablet'
disable_font_rescaling: True
embed_all_fonts: True
epub_version: '3'
preserve_cover_aspect_ratio: True
dont_split_on_page_breaks: True
flow_size: 0
page_breaks_before: '//h:h1 | //h1'
margin_top: 0.0
margin_right: 0.0
margin_bottom: 0.0
margin_left: 0.0
dehyphenate: False
unwrap_lines: False
fix_indents: False
delete_blank_paragraphs: False
markup_chapter_headings: False
renumber_headings: False
italicize_common_cases: False
format_scene_breaks: False
keep_ligatures: True
verbose: 2

Regardless of whether I set them via the GUI or edit the following files, Calibre resets them back to where they were

epub_output
{
"dont_split_on_page_breaks": true,
"flow_size": 0,
"no_default_epub_cover": false,
"no_svg_cover": false,
"epub_inline_toc": false,
"epub_toc_at_end": false,
"toc_title": null,
"preserve_cover_aspect_ratio": true,
"epub_flatten": false,
"epub_version": "3",
"epub_max_image_size": "none",
"preserve_css": true,
"preserve_cover": true,
"preserve_images": true,
"preserve_layout": true,
"preserve_page_breaks": true
}
heuristics
json:{
"enable_heuristics": false,
}
look_and_feel
{
"disable_font_rescaling": true,
"embed_all_fonts": true,
"subset_embedded_fonts": false,
"expand_css": false,
"smarten_punctuation": false,
"unsmarten_punctuation": false,
"transform_css_rules": "[]",
"transform_html_rules": "[]",
"remove_paragraph_spacing": false,
"insert_blank_line": false,
"remove_paragraph_spacing_indent_size": 1.5,
"linearize_tables": false,
"base_font_size": 0.0,
"minimum_line_height": 0.0,
"line_height": 0.0,
"keep_ligatures": true,
"italicize_common_cases": false,
"format_scene_breaks": false
}
page_setup
{
"input_profile": "default",
"output_profile": "tablet",
"margin_top": 0.0,
"margin_right": 0.0,
"margin_bottom": 0.0,
"margin_left": 0.0,
"remove_fake_margins": false
}
structure_detection
{
"page_breaks_before": "//h:h1",
"chapter": "",
"chapter_mark": "pagebreak",
"markup_chapter_headings": false,
"renumber_headings": false,
"unwrap_lines": false,
"delete_blank_paragraphs": false,
"dehyphenate": false,
"fix_indents": false,
"no_inline_navbars": false,
"toc_threshold": 6,
"max_toc_links": 50
}

[Quoth]

Where are your files stored?
What OS is it?

[BetterRed]

When are they reset? In same session, in next session….

Are other settings reset, e.g. Look and feel, Tweaks, etc?

BR