Is it possible to change the Ag text to Aa in the font selection?

It is possible to do that on iOS. First to configure the text in the textOptions tool you can use this snippet when setting up Configuration:

let configuration = Configuration { builder in
            builder.configureTextOptionsToolController { options in
                options.actionButtonConfigurationClosure = { cell, textAction in
                    guard textAction == .selectFont else { return }

                    cell.iconImageView.image = IconGenerator.generateTextImage(with: UIFont.systemFont(ofSize: 20), of: CGSize(width: 36, height: 36), text: "Aa")?.withRenderingMode(.alwaysTemplate)
                }
            }
        }

Then for the font menu you will need to write a custom FontListSectionController like this:

class MyFontListSelectionController: FontListSectionController {
    private var fontMenuItem: FontMenuItem?

    open override func didUpdate(to object: Any) {
        super.didUpdate(to: object)

        if let fontMenuItem = object as? FontMenuItem {
            self.fontMenuItem = fontMenuItem
        }
    }

    open override func cellForItem(at index: Int) -> UICollectionViewCell {
        guard let cell = super.cellForItem(at: index) as? MenuCollectionViewCell,
              let fontMenuItem = fontMenuItem else {
            fatalError()
        }

        if let uiFont = UIFont(name: fontMenuItem.font.fontName, size: 20) {
            cell.iconImageView.image = IconGenerator.generateTextImage(with: uiFont, of: CGSize(width: 36, height: 36), text: "Aa")?.withRenderingMode(.alwaysTemplate)
        }

        cell.captionTextLabel.text = fontMenuItem.title
        cell.accessibilityLabel = fontMenuItem.accessibilityLabel

        return cell
    }
}

Once you have done that, where you initialize the licence, someplace after that replace stock FontListSectionController with MyFontListSelectionController which is done like this:**try**! IMGLY.replaceClass(FontListSectionController.**self**, with: MyFontListSelectionController.**self**). Let me know if you have any more questions.