[roger64]

This is what I have in reader.footer.lua

selecting only true or false values

function ReaderFooter:init()
    self.pageno = self.view.state.page

    self.settings = G_reader_settings:readSetting("footer") or {
        disabled = false,
        all_at_once = true,
        progress_bar = false,
        toc_markers = false,
        battery = true,
        time = true,
        page_progress = true,
        pages_left = false,
        percentage = false,
        book_time_to_read = false,
        chapter_time_to_read = false,
    }

also in settings.reader.lua (footer values may or may not be kept as such, I have it on Kobo but not on Kindle...)

        ["frontlight_intensity"] = 15,
	["footer"] = {
		["progress_bar"] = false,
		["disabled"] = false,
		["toc_markers"] = false,
		["battery"] = true,
		["pages_left"] = false,
		["all_at_once"] = true,
		["page_progress"] = true,
		["time"] = true,
		["percentage"] = false
	},

And at last, you can tick your customized values on the menu entry "status bar"

One of them should work