Save columns settings report

Hello,

I would like to know how to save or edit the marked columns settings in a report.
On every browser refresh the columns are back to standard. I know with cookies some will stay.

Is there any other way??

No other way without code changes.

Do you know where to find the right java file for this?

I edit the column names in Reportcontroller in app/view

    routeColumns: [{
        text: Strings.reportDeviceName,
        dataIndex: 'deviceId',
        renderer: Traccar.AttributeFormatter.getFormatter('deviceId')
    },  {
        text: Strings.positionFixTime,
        dataIndex: 'fixTime',
        xtype: 'datecolumn',
        renderer: Traccar.AttributeFormatter.getFormatter('fixTime')
    }, {
        text: Strings.positionLatitude,
        dataIndex: 'latitude',
        renderer: Traccar.AttributeFormatter.getFormatter('latitude')
    }, {
        text: Strings.positionLongitude,
        dataIndex: 'longitude',
        renderer: Traccar.AttributeFormatter.getFormatter('longitude')
    }, {
        text: Strings.positionStatus,
        dataIndex: 'status',
        renderer: Traccar.AttributeFormatter.getFormatter('status')
    }],

But when refresh web all the standard columns are back. Do i need to change app.min file also?

You need to compile the minified version. Please read the documentation.

And wich part of the documentation will guide me there. Or do i need to read all the documentation to get there?

If you don't want to use search or at least some common sense then probably all.