Hello there, @KK71 ...
As I read through your question, I wonder if you might be using some alternative ways to create assignments in your course. I see what you are referring to, though. When you are on your "Assignments" index page, you are clicking on the "+" sign in the gray heading of an Assignment Group where you then get a "Create Assignment" dialog box. I wasn't exactly sure what you had meant initially by a "More Options" button, but I do see this in the "Create Assignment" dialog box ... as you have indicated. In essence, each time you do this, you are just creating the assignment shell...as outlined in this Guide: How do I create an assignment shell in an assignment group?. Here is my suggestion for you...
Instead of using the "+" sign to bring up the "Create Assignment" dialog box from the "Assignments" index page, have you instead considered using the larger "+ Assignment" button at the top right corner of the "Assignments" index page? Clicking on this button instead presents you all the details you need immediately to create your assignment...the title, description, points, selection of which Assignment Group you want to place it in, submission type, etc. Once you have these details entered in your assignment, you can either "Save" or "Save & Publish".
You also mentioned that you are having to repeat this process multiple times when you create new assignments. I'm not sure if you've used this feature of Canvas, but on the "Assignments" index page, within the three-dot kebab menu of each assignment, you'll find an option to "Duplicate". This essentially creates a copy of any previous assignment that you've already edited. You can then edit the properties of the new copy without having to create a brand new assignment each time. This is really helpful if, for example, you had some properties of your assignments that remained the same and would not change...for example: due dates, certain parts of your instructions to students, number of points, etc. Here is a Guide for you on how to do this: How do I duplicate an assignment?.
I hope that these resources will be of help to you and that maybe this will help you in creating your assignments a bit quicker than before. If you have any other questions about this, please let us know here in the Community, and we'll be glad to help you as best we can.
Take care, and be well.