choosing page by using dax in powebi - powerbi

I make 2 page for night and day in Power bi, I want by passing time in the night background go dark and in the day background back to white , I Don't know how choose page with Dax Code ? Thanks friends

Currently, Power BI doesn't support this feature.

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Get Previous Month Data - Power BI

I need support of yours for my query.
Currently i have set of records which includes date column as well.
Here on click of a button, i need to check current date and show previous 30 days data.
If any one give me idea on how to do this in Power Bi it will be really helpful.
Thanks

I'm a Power BI noob struggling to understand how bookmarks work

Our Power BI developer quit and I've inherited his applications. The problem is I have no Power BI experience and am learning via trial by fire. I've currently been tasked with adding some new fields to an app that's using bookmarking. Below is a picture of my app, I added the # Student Grades cards under each score. Users have the ability to see current Progress scores, end of Semester 1 scores, or end of Semester 2 scores. As I understand it, that means I need to add the same card three times -- one for each view/bookmark, and then in the section grid hide/unhide the appropriate cards. The issue I'm having is that when I'm ready to Update a bookmark, I'm clicking on the three ellipses next to the bookmark and selecting "Update". The issue though is that it makes that update to all the bookmarks! Can someone tell me where I'm going wrong?
I'm using Power BI Desktop V2.108
Thanks in advance for any help you can give!!
check if there is any Group in the bookmarks... also check the below All Visuals checked or not...

Can I create a scordcard with a percentage change in Power BI

I'm new to PowerBI.
I wanted to create a scorecard that looks like the one in data studio where it displays the total value and percentage change from the previous period.
Below is the screenshot from Google Studio
You can add % from the data view in powerbi desktop,
PowerBI has some learning curve compare to Google Studio. I would recommend you to explore more and get yourself comfortable and try to find answers yourself.
But you should be able to achieve the output you're expecting using measures. Measures are similar to excel formula that allow you to calculate from existing values.
checkout the following resources:
Show Growth Value and Percentage in one Power BI Card visual
How to show percentage change in Bar chart visual in Power BI

PowerBI automate visuals

Is there any way how to create visuals dynamically?
Simply speaking, once data is refreshed it shows 7 customers. PowerBI will show me 7 graphs for each one. Next time I refresh I have 12, so I will have 12 visuals.
Thank you #Jacek Wróbel; I did not know about this visual.
Reviewing this I noticed Small multiples were added into PowerBI December 2020 and while I was hoping for the Donut visuals, it's more then enough for the solution I was looking for.
https://powerbi.microsoft.com/en-us/blog/announcing-small-multiples-public-preview/

Is there a way to change Power BI interface to black/grey/dark?

Is there a way to change Power BI interface to a dark theme? I don't have a old version on Power BI to revert to, and since they've released the new version the interface seems to be light only.
I have tried to look in File>Options and Settings>Settings but I can't see any options there for any themes.
Power BI Desktop only comes with the light theme since the interface change about 6 months ago, and there is no 'dark mode' at this time. MS have stated that it is on the roadmap for Power BI Desktop, but as of Nov 2020, there is no confirmed date.
There is an Power BI Ideas for this option which you can vote for, which is in the top 5 of the voted ideas so far.