I searched but could not find a solution to split the editor to allow working with two open files next do each other.

I found the "IDM Power Tip: Drag-N-Drop Split Pane Editing" but this does not help. In the "Note" it says: " In order to use the vertical/horizontal split window, you need to make the tabs “Undockable”. You can change this configuration setting in Advanced : Configuration : Application Layout : File Tabs : Operation by unchecking the “Dockable” tabs option."

Because I can't move the tabs (they stay fixed, there is nothing to move) I thought I should follow the advice in the note. But ,,,

The "note" is frustrating: It does not say *where* I can find "Advanced": Does it refer to "Preferences" -> "Editor" -> "Advanced"? However, in my version of UE there are only two things to check: "Load/restore printer settings" and "Grouped undo", but not "Application layout". Is there any other "Advanced" setting in UE? If yes, where? Not very helpful, indeed. A power tip should really help to do things, but it does not.

Thus I searched further for a way to make the tabs "undockable". But because there is a confusing number of versions of UE and because explanations rarely mention to which version the explanation refers, hints like "If you have the Advanced menu and the open file tabs are gone, click on View - Views/Lists - Open File Tabs." does not help because it does not say *where* I find the "Advanced menu".

In my version of UE (version 20.00.0.34 for Linux), I can't find "View/Lists" under "View" (although "View" exists). WHY IS THERE NO SIMPLE MANUAL FOR MY VERSION OF UE? Because the online search for help is extremely frustrating, I hope that there are people out there who can help me.

I only use UltraEdit for Windows so cannot say for sure if the Linux version will have the same options. If I right click on an open file tab, I get a context menu that includes a sub-menu with the file tab settings as shown in that attached screenshot. Alternatively, I can go to Advanced / Settings / Application Layout / File Tabs / Operation to configure the file tab operation.

Cheers,
Frank

Thank you Frank for you quick reply!

I am not exactly sure what you mean by "Open File" Tab. The screenshot next shows what I see in my version of UE (Linux):

If  I click on (1) the common "Select File" window opens from which I can choose the file to open.
If I click on (2) I see the following options (not a screenshot because after clicking on "File" I can't take screenshots, hence I took the effort to transfer what I see into a text document):

Here there is no "File Tabs" sub-menu.

You are writing "Alternatively, I can go to Advanced / Settings / Application Layout / File Tabs / Operation to configure the file tab operation." I don't know where I can find "Advanced".

Any idea what I should do to solve my issue? Ultimately, I "only" want to split the editor window to allow working with two open files next do each other.

Thanks a lot, Mofi, for your detailed explanation, especially for pointing me to the UE Power Tips for Linux. I was not aware that the Power Tips are specific for Windows and Linux -- when you arrive at a Power Tip by some searching, it is not possible to recognize that the tips shown are for a specific version of UE (neither in the tips for Windows, nor in the tips for Linux).

The problem is solved: I have to drag the file tab to the scrollbar, not into the editor.

Thanks again -- I did start already looking for alternative text editors for Linux that allow me to do what I need. BTW (on a different topic, of course): The problem of sorting within text files that is also specific for UEX and reported two years ago (see "Sort file starting in a specific column") could not be solved up to now and I gave up.