Unfortunately your question is ambiguous.
Behaviour of bullets and numbers somehow departs from what other “objects”, notably text, do. I am afraid that you don’t understand what Numbering Alignment > Right does.
Parameter Aligned at defines a reference position. Think of it as a vertical axis or a vertical. guideline. Then Numbering alignment tells where this virtual axis is relative to the number. Left means the axis is at left of number (in other words, the number is on the right of the axis; this is quite troublesome, isn’t it?).
When you ask for “Numbering Alignment, Right”, do you mean you want the least significant digit of all numbers to be aligned on the same vertical, achieving what we call right-aligned in text? Then, yes, Numbering alignment must be set to Right so that the number will expand to the left.
But … Format>Bullets & Numbering is a bad compatibility feature. It has been offered as a quick and dirty service for those who come from Word where text structuring abstraction is poor or non-existent. The feature, to be as much compatible as possible with Word, is a kind of one-size-fits-all service able to format all lists in a document. and to do that, it is a “fire-and-forget” service. As soon as you leave a list occurrence, everything is reset so that the next list occurrence is not biaised by the previous one.
Another consequence of this implementation is the configuration is not saved, neither in the document nor in the user profile.
So, what is the solution? … Learn how to use styles. Styles are ubiquitous in Writer. One of categories is called list styles. The name is not the best one. List styles only control the aspect of the bullet/numbering and take over the indent of the paragraph style on the side where the number appears (left for LTR languages, right for RTL scripts).
You can either customise a built-in list style (click on the fifth icon in the side style pane toolbar) or create your own. If you have several semantically distinct lists, create as many list styles.
To make your list styles known by default, create them in a blank document (based on the default template or any template of your taste) and save it as a template. Then make it your default template (this is why I recommended to base it on your current preferred template).
PS: when asking here, always mention OS name, LO version and save format. For instance, the solution given here won’t work if your documents are save .docx because there is nothing like list styles in DOCX.
