Please enable scrolling through months, I don't why it is not a feature already when it was on the previous (old) calendar app. So not intuitive, you have to navigate through months by clicks.

Would be good to click on and event on the calendar and just by drag and drop it change its date/time

It might be because it is new or I can't find it, but there is seemingly no option to change calendar colors, like my personal calendar is blue, but I want it to be green. Also, a 'high contrast' setting like on android app bringing darker colors to events.

Microsoft To Do is a convenient application.I can record what I want to do .Though Calender has some similar functions,it's better to sync with To Do (Even just "My Day") and show my plan on the Calender by timeline.

The sidebar is a bit bare with just the current month in it. It seems like a waste of good space. Perhaps it could show the next few months' calendars for date selection? Or perhaps it could show a list view of upcoming events below the one month calendar shown now?

Just like the old Calendar

Make the arrow keys work so you can move around the calendar. Make the calendar be able to be scroll the months up or down.

A search button for searching events is a basic option in another Calendar apps

Option for week number in all views

I want to create my own theme

Remove the ads for other Microsoft products in this app.

Make it possible to show weeknumbers in the month calendars

It would be nice if you could use arrow keys to move the currently selected day.

Agenda view is only visible in month view. Please make it available with every view, or even include it in the left sidebar as requested in https://outlook.uservoice.com/forums/919084-windows-10-calendar-preview/suggestions/39553060-more-content-in-the-sidebar

React Native Windows does support Acrylic Brushes: https://microsoft.github.io/react-native-windows/docs/windowsbrush-and-theme

It would be nice for that to show in the spots where there is a picture background.

Add the ability to scroll horizontally (by swiping on the trackpad) like you could in the non-preview version.

Currently, you can add a description to an event on creation, but it's no longer possible to add one after creation, when editing the event.