My positron settings file

settings.json

{
    "workbench.startupEditor": "none",
    // adds more lines to the file tab
    "workbench.tree.renderIndentGuides": "always",
    "workbench.colorCustomizations": {
        "editorRuler.foreground": "#ff4081"
    },

    "editor.fontFamily": "Maple Mono NF, FiraCode Nerd Font, JuliaMono Nerd Font, Agave Nerd Font, monospace",
    // "editor.fontLigatures": true,
    // for Maple Mono specifically:
    "editor.fontLigatures": "'ss05', 'ss07', 'ss09', 'cv02', 'cv05', 'cv31', 'cv34', 'cv35', 'cv38'",
    "editor.wordWrap": "wordWrapColumn",
    // add vertical lines at 80 and 120 characters
    "editor.rulers": [ 80, 120 ],

    // handle newline saving adapted from
    // https://rfdonnelly.github.io/posts/sane-vscode-whitespace-settings/
    "files.insertFinalNewline": true,
    "editor.renderFinalNewline": "dimmed",
    "files.trimFinalNewlines": true,
    "files.trimTrailingWhitespace": true,

    // also render trailing whitespace, since it'll get trimmed
    "editor.renderWhitespace": "trailing",

    // better pasting
    "editor.formatOnPaste": true,
    "[r]": {
        "editor.formatOnSave": true
    },

    // pretty cursor
    "editor.cursorBlinking": "phase",
    "editor.cursorStyle": "line",

    "git.autofetch": true,
    "git.confirmSync": false,
    "github.gitProtocol": "ssh",

    "terminal.integrated.defaultProfile.windows": "Git Bash",
    "terminal.integrated.fontSize": 12,

    "window.newWindowDimensions": "maximized",
    "window.restoreFullscreen": true,

    // ctrl+n opens a new file in R by default
    "files.defaultLanguage": "r",

    // error delay so errorLens is less noisy
    "errorLens.delay": 750,
    "editor.scrollbar.verticalScrollbarSize": 12,
    "editor.scrollbar.horizontalScrollbarSize": 8,
    "diffEditor.codeLens": true,
    "editor.tabSize": 2,
    "editor.autoIndent": "brackets",
    "editor.renderLineHighlight": "gutter",
    "diffEditor.renderSideBySide": false,
    "githubPullRequests.pullBranch": "never",
    "quarto.render.previewType": "external",
    "quarto.cells.background.color": "useTheme",
    "quarto.visualEditor.spellingDictionary": "en_GB",
    "positron.r.quietMode": true,
    "positron.r.interpreters.default": "",
    "editor.guides.highlightActiveBracketPair": false,
    "editor.guides.bracketPairsHorizontal": false,
    "editor.matchBrackets": "never",
    "python.defaultInterpreterPath": "",
    "files.associations": {
        "renv.lock": "json"
    },
    "workbench.activityBar.location": "top",
    "python.environmentProviders.enable": {
        "Conda": false
    },
    "diffEditor.ignoreTrimWhitespace": false,
    "githubIssues.workingIssueFormatScm": "${issueTitle} \nShould close ${issueNumberLabel}",
    "console.fontLigatures": true,
    "terminal.integrated.fontLigatures.enabled": true,
    "console.fontSize": 12,
    "editor.tokenColorCustomizations": {
        "textMateRules": [
            {
                "scope": "comment",
                "settings": {
                    "fontStyle": "italic"
                }
            }
        ]
    },
    "editor.lineNumbers": "relative",
    "terminal.integrated.cursorStyle": "underline",
    "terminal.integrated.cursorStyleInactive": "none",
    "workbench.externalUriOpeners": {
        "http": "vivaldi"
    },
    "workbench.externalBrowser": "vivaldi"
}