BOOX Note Air 4 C · Customization
Optimise a single app on the BOOX Note Air 4 C
The per-app optimisation dialog controls refresh, colour, contrast, DPI and animations for one app. Here is what each setting does and sensible starting points.
The optimisation dialog is where a BOOX goes from “usable” to “good”. On the Note Air 4 C there is one extra lever — the per-app colour toggle. Set text readers to black-and-white and HD, keep colour on for comics and magazines, set full-refresh frequency (off for KOReader), nudge contrast only if text is grey, fix the DPI if the layout is wrong, and filter animations. Ten minutes per app.
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Open the optimisation dialog for an app
From the Apps screen, long-press an app and choose "Optimise" (or open the app, then swipe down for the control centre and tap the optimisation icon). A panel of sliders and toggles appears, applying only to that app.
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Set the refresh mode
Text readers get HD or Regal; browsers, comics and stores get Balanced or Fast. This overrides the global mode whenever the app is in front.
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Choose colour or black-and-white
For a plain text reader, set black-and-white — it is sharper and refreshes cleaner. For a comic, magazine, maps or photo app, keep colour on. This toggle is per app, so your Kindle app can be black-and-white while Komikku stays colour.
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Set full refresh frequency
"Full refresh every N pages" clears accumulated ghosting. Every 1 page is cleanest but flickers most; every 3 to 5 is a common compromise. For an app that manages its own refresh (KOReader), turn this off.
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Adjust contrast, bleach and sharpen
"Enhance contrast" or "bleach whites" fixes grey-looking text and faint UI. Use it sparingly — too much crushes thin fonts. "Sharpen" or "bold text" helps small type. Colour content generally needs less of this.
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Change the app's DPI if the layout is cramped or huge
Some phone apps show a tiny layout or an oversized one on the 10.3-inch screen. The DPI slider rescales the app — nudge it until buttons and text are comfortable, then reopen the app to apply.
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Filter animations and handle dark themes
Turn on "animation filter" for almost every reading and store app to stop fades and page-curl stutter. If an app forces a dark theme, use the "force light" or colour-invert option so text is dark-on-light.