I can't believe this suggestion doesn't already exist, but I work on a 32" or a 27" monitor all the time. I have plenty of screen real estate. Why not let me view both Assets and Layers panels at the same time?

Will be added Material Theme Editor?

Include a "find font" panel like in Adobe Illustrator to globally replace one font with another. Even with the symbol/assets panel this is hard for documents that you did not architect and may require a lot of extra work (i.e. the iOS UI kits in a windows environment where San Francisco font has to be downloaded from third party sources and converted manually to .ttf)

Being able to change the reference point from the upper-left to center or lower right or whathaveyou is so useful in other Adobe apps. Having to do everything with top-left x/y is a pain when trying to position objects by their center.

Choose point by clicking 9-grid icon

One of the most convenient alignment features in illustrator is the 'align to key object', which Sketch doesn't support, making it difficult to align objects quickly. Please add that feature for XD.

Transparent PNGs do not allow color edits. Editing fills will extend to the rectangular bounds, not just the object

Apparently only JPG/PNG is supported when performing drag & drop of a set of images.
My assets are often SVG so supporting that format there would spare me from having to generate temporary PNGs or place manually.

It seems currently it adds all SVGs on all cells when dropping and creates a mask of all the files combined(??).

Thank you.

Ability to right-click to swap Symbols in Design mode
Or replace selected artwork with an existing Symbol

This request does NOT cover nested-symbol overrides (swapping an inner symbol differently in each copy of an outer symbol). For that, please upvote https://adobexd.uservoice.com/forums/353007/suggestions/19592509-nested-symbol-overrides

Ability to add a device outline to show context.. would be cool to even create your own device outline (currently I'm designing a UI prototype for a smart credit card, but having to use a mobile screen UI canvas to show the interactions)

the ability to apply image filters and treatments such as "hue, saturation, levels, etc".

Get rid of the hamburger menu, and give windows users a full on top menu like in Photoshop or Illustrator. Hiding options behind an icon is a major pain. As a user of both Mac and Windows, I'd love for the program to be the same across both operating systems.

Stacking artboards can help to clear space for working and rearranging artboards.

Also we can stack artboards by size or type.

Sometimes you need to reorganize your design system files. Once you have created a master components, you cannot move it to another file, and you are stuck with the current file forever.
It would be great if you can just move your Master Component from one document to another.

On the web, i often use line height to determin the height of the types container. Therefore the text should sit vertically centrally to its line height. This is different to how line height works in print.
I also use line height for vertical rhythm. see more info on this here:
http://typecast.com/blog/4-simple-steps-to-vertical-rhythm

vertical rhythm is a huge factor when I design for web

It's quite frustrating that every time I use the shape tools, I have to remove the stroke and change the fill.
Like in ID and AI, it would be useful if the object fill and stroke remembers the previous settings, or a default could be somehow set.

Allow users to select Opentype features supported by a given typeface. This would be especially useful for anyone designing for ecommerce (tabular lining numerals), or text-heavy sites (small caps, proportional old style numerals), or rich typography in general (alternate stylistic sets, swashes, superscript, subscript, fractions). Common ligatures seem to be enabled already, but there's no way to access discretionary ligatures.

https://klim.co.nz/blog/towards-an-ideal-opentype-user-interface/

Making more complex vector drawings is difficult without a tool like the scissor tool from Illustrator.

Creating arches like the attached image in Illustrator is super easy with the combination of the scissor and circle tool, but in XD it is very difficult.