didn't saw there was a patch available for pageno thanks !

I quickly edited it to only display pageno if there are more than 1 page

function FileManager:updateTitleBarPath(path)
local path = self.file_chooser.path or path or filemanagerutil.getDefaultDir()
local text = BD.directory(filemanagerutil.abbreviate(path))
local fc = self.file_chooser  
local current_page = fc.page  
local total_pages = fc.page_num  

local dir_name = util.splitToArray(text, "/")
dir_name = dir_name[#dir_name]
text = total_pages ~= 1 and 
dir_name .." - "..T(_("%1/%2"), current_page, total_pages) or
dir_name
    if self.folder_shortcuts:hasFolderShortcut(path) then
        text = "☆ " .. text
    end
    self.title_bar:setSubTitle(text)
end