UPDATE: Affinity Designer 1.5.3 is now available on the Mac App Store and fixes the problems described in this thread.
*** PLEASE NOTE *** We have just noticed a problem with the latest Mac AppStore Designer update (ver 1.5.2) and are working to resolve it have resolved it.
Running this update will reset any brushes, styles, text styles, swatches, keyboard shortcut customization and workspace layout you may have added.
We are extremely sorry about this and will have a fix available within the next 24 hours.
If you have installed the new update and have customised any settings then please don't run Designer until we have deployed a replacement update (Designer ver 1.5.3).
Alternatively we have a workaround available to save the presets for those users that have updated but haven't opened the app yet.
Again, we are very sorry and will make sure this never happens again.
UPDATE: Affinity Designer 1.5.3 is now available on the Mac App Store and fixes the problems described in this thread.