Changes the readable line length in Obsidian Notes. Tested in Obsidian v0.14.6

README.md

Adjustable Readable Line Length in Obsidian with Style Settings

This is a CSS snippet that will let you easily change the length used for the Readable Line Length Editor setting in Obsidian. You will need to have the Style Settings plugin installed and enabled in your vault in order to change the setting in-app. The plugin can be found in the Community Plugins inside of Obsidian, or you can manually install if you wish. If you choose not to use Style Settings, you'll be able to manually adjust the --read-line-length property in the snippet instead.

By default, this snippet uses pixels as its unit, but you can change that in the snippet by changing the line format: px to some other unit, such as format: vw, and changing the property declaration in body {} to use the same unit. You probably should change the default value from 700 to something else, too 😅.

ARLL_StyleSettings.gif

obsidian-vii-adjustable-readable-line-length.css

/* Changes the readable line length in Obsidian Notes. Tested in Obsidian v0.14.6
See also: https://forum.obsidian.md/t/adjustable-readable-line-length/7564/6
Note: For this the "readable line length" property in settings has to be enabled
(as expected). 700px width is the application's default, adjust all numbers below. 
Pixel (or percentage) as a unit enables a width independent from the number of characters 
(good when adjusting zoom level / font size). For fixed amount of characters use  rem
Original snippet by https://gist.github.com/vii33 , modified by sailKite to use
custom properties and enable Style Settings support*/

/* @settings

name: Adjust Readable Line Length
id: adj-read-line
settings:
    -
        id: read-line-length
        title: Length
        type: variable-number
        description: Length in pixels.
        default: 700
        format: px

*/

body {
    --read-line-length: 700px;
}

/* Width in preview / read mode */
.markdown-preview-view.is-readable-line-width .markdown-preview-sizer, 
.markdown-source-view.is-readable-line-width .cm-content {
    max-width: var(--read-line-length);
}

/* Widths in editor mode */
.markdown-source-view.mod-cm6.is-readable-line-width.is-rtl .cm-contentContainer {
    max-width: var(--read-line-length);
    margin-left: auto;
    }

.markdown-source-view.mod-cm6.is-readable-line-width:not(.is-rtl) .cm-contentContainer {
    max-width: var(--read-line-length); 
    margin-right: auto;
}

.markdown-source-view.mod-cm6.is-line-wrap.is-readable-line-width .cm-line:not(.HyperMD-table-row) {
    max-width: var(--read-line-length);
}

.markdown-source-view.mod-cm6.is-line-wrap.is-readable-line-width .cm-content {
    max-width: var(--read-line-length);
}