Since version 4.0.0 gReader introduced the new Material Design. One of its element is the floating action button (FAB) to mark all as read. To mark all articles as read you can swipe the button horizontal. Swiping vertical give you more additional options. With the update v4.0.2 we make it customisable. You can customise its position, style or opacity to your desire. All settings can be found in Settings->Reading Preferences->Mark All As Read.
Disable – Mark all as read button is located in actionbar.
Left – Located at bottom left
Right – Located at bottom right
Simple – Use simple color as background.
Material – Use accent color of material design theme.
Fully tranparency – 25% visible – 50% visible – 75% visible -Fully opaque