Unification of textFrame style

Hi @jirik79416729, in addition to what @Robert at ID-Tasker has suggested, please have a look at this script. It will give you some ideas. The key is the clearOverrides method of many text objects. You can clear paragraph style overrides or character style overrides or both.

- Mark

function main() {

    var doc = app.activeDocument;

    /* Example 1:
         clear overrides in selection
         (first select one or more text frames or some text)
    */
    clearTextOverridesInItems(doc.selection);

    /* Example 2:
       clear overrides in whole story
       (first select a text frame)
    */
    // clearTextOverridesInItems(doc.selection[0].parentStory);


    /**
     * Clears style overrides from text
     * or textFrame(s) or story.
     * @author m1b
     * @version 2022-10-22
     * @param {PageItems} items - any indesign objects with 'texts' property.
     */
    function clearTextOverridesInItems(items) {

        if (!items.hasOwnProperty('0'))
            items = [items];

        var texts = [];

        for (var i = 0; i < items.length; i++)
            if (
                items[i].hasOwnProperty('texts')
                && items[i].texts[0].isValid
            )
                // note we want hard references here, because
                // the text may reflow after clearing overrides
                texts.push(resolve(items[i].texts[0].toSpecifier()));

        for (var i = 0; i < texts.length; i++)
            texts[i].clearOverrides(OverrideType.ALL);

    };

} // end main

app.doScript(main, ScriptLanguage.JAVASCRIPT, undefined, UndoModes.ENTIRE_SCRIPT, 'Clear text overrides');