provisional solution for different wallpaper in portrait layout and different for landscape layout

1) For portrait layout set original android wallpaper, how you best suits. (Customize Lightning…/settings/current desktop/wallpaper and background/change the system wallpaper…

2) Add…/application or shortcut/choose some item. For example shortuct/activity/ll-action/do nothing (lock). Now you have on desktop new icon (house with lightning).

3) long tap to this icon. Customize…/more…/ in text set display the label to no. In Icon set display the icon to no. In Box select (tap to) content and  select normal background (and choose your prefered picture optimalized for landscape layout). In + set clickable to no. Press back key.

4) Now you are on desktop. Go to: Customize Lightning…/settings/current desktop/layout/dual position set to yes. Now go to: Customize Lightning…/settings/general/Honour pinned items in edit mode set to no. Press twice back key.

5) Now you are on desktop. Long tap to free place and select edit layout. Now long tap to your shortcut with your new picture wallpaper. Select positions…/move front/behind/ and select left red icon, now press back key.

6) Now you rotate your device to landscape layout. Find your shorctut with picture. Tap to free place and select edit layout. Now long tap to shortcut and select position…/detach from grid, zoom out, and resize your shortcut for all home screen (bordered with white line) – you can zoom in/out for better work. If you resize shortcut, you can see white line on shorcut. Please add this white line to white line from editor layout. (for all side). You can long tap to shorctut and select position…/geometry/ Press dot in cross. Press width and set your width. Press height and set height. Again press dot in cross (many time) now is on screen with left and top. Please set left 0 and top 0.Press back key. Press home key. Long tap to free place, select edit layout/position/pin. Press back key. Now you have own wallpaper for landscape layout different from portrait layout, but…

7) Now you are on desktop. You must have device in portrait layout. You can see your shortcut with wallpaper for landscape layout. Now we must hide this shortcut. Long tap to free place and select edit layout. Now long tap to your shortcut and move this shorctut outside the screen (far away after white border). Press back key. Press home screen button.

8) Propably on both layouts (landscape and portrait) you can now slide with other apps and widgets… You can go to edit layout and add some stop point (How you prefer).

Unfortunately, this can not be solved for background in all apps (app drawer).