How to change the master page order in an alphabetical order?

On the upper side of the Pages panel, you can drag the Masters into whatever order you want. You can Opt/Alt click the label of a Master (now called Parent) page to rename it. Don't forget you can also color code pages and parent pages if you like by right-clicking them!

To apply masters to pages, you can drag and drop the parent pages onto individual pages, or...

Pre-select individual pages with the help of Shift-clicking them for contiguous ranges of pages or also Cmd/Ctrl clicking pages for discontiguous page ranges; then Opt/Alt click the Master (Parent) page icons to apply the parent to those selected/targeted pages. 

There is also a Pages panel menu button flyout that says "Apply Master/Parent to Pages" where you can choose which Master/Parent page you will apply to whatever page range you type into the dialog box.

Finally, don't forget the Layout > Pages > Apply Parent (aka Master) to Pages.

I am using both terms (old: Master; new: Parent) in case you are on an older version.

coye said: "I've rearranged some master page order so now they are not in an alphabetical order. How can I fix it?"

Barb is right. But there is one detail to add perhaps:

Select the name of the master to drag it around.

coye said: " is there a way I can move all master pages into the page section"

No. It depends what you want: If you want the editable contents of a master on a document page you could copy the contents and paste it to the document spread. Use Paste In Place for this. After that you can remove the master spread if you do not need it anymore. On the other hand, if you do not want the editable contents on a document page, just apply the master to that page.

FWIW: In InDesign 2022 the word "master page" is substituted with "parent page".

The functionality did not change; just the name.

Regards,
Uwe Laubender

( ACP )

There is no way to automatically fix the naming of the rearranged Master pages. You can rename them manually in the Master Page Options dialog (accessed from the Pages Panel pull-down menu). That can be a bit tricky, however, since InDesign will not let you rename a Master with a name that already exists. You will have to first rename them with a name that is not in use and then go back and give them the proper new names. Changing the Prefix will change the name of the Master.

You don't have to drag new pages into the Pages Panel first before applying a Master page. You can use the Insert Pages command from the Pages Panel pull-down menu to insert the pages with the appropriate Master already applied. It gives you the option also as to where in the document the new pages should go. If the Masters don't run consecutively through the document, though, you will have to do it multiple times for each Master. Or you could set up your document first with all of the pages in place using either blank pages or just one of the Masters and then use the "Apply Master to Pages..." option under the Pages Panel pull-down and then assign a specific Master to whatever pages you list (using a comma between each) in the field that is provided there.