Mobile: How to indicate presence of landscape mode and expandable elements?

Problem:
My company has a desktop website to display reports, and now also a mobile website. The reports there have only 3 columns in portrait mode to keep it clean, but show extra columns when you switch to landscape mode. …
How to AB Test a particular component across the whole site?

I want to do a AB test for the navigation module across the whole site.
I know AB/Multivariate tests are usually page specific.
Is there any way to do AB Testing across a whole site? So, we can change something across the wh…
When to hide, disable or gray out a button that shouldn’t be clicked on until a field is filled?

I’ve heard two conflicting principles for UI design.
disable or hide functions that are not applicable to the current state of the program (maybe this is more for large forms such as in surveys)
always make apparent all fun…
For a startup, should product requirement understanding be considered a part of UX process.

I am a part of a small organization. Should our UX lead be the part of the requirement elicitation process? Is it a general practice in the industry?
The process we are going through is finalizing and prioritizing the produ…
How to handle a fixed element when the viewport is narrower than the page content (resulting in horizontal scrolling)?

Our designers and product managers like to use fixed elements in some pages of our site to keep something persistent. The problem is when a user makes their browser narrower than our page (which has a pixel-defined width), re…
Is there any methods other than user interviews/survey so that we can separate not useful content to mobile users.

I want mobile browsing faster. Now i am in confusion which content is not useful in mobile. Looks like all content are needed. Help me!
My site is about a software product for time management
Where does Business Analyst fits in core UX/UI technology flow

User Experience (UX) Designer = Research + Design
UI Developer = Design + HTML/CSS/JS
Application Developer = HTML/CSS/JS + Back-End coding
With reference to above diagram i would like to know where does Business Analyst…
Choose between single or double buttons for two actions

I’m trying to find what is the best approach for the following scenario.
I’m building Music Player App(iOS). For each played song we have two options :
Add the song to My Music Library
Add the song to a new/exist Playlist
…
How do I perform a first edit?

I am trying to earn badges to increase my use of UXSE. To earn the editor badge I need to perform a ‘first edit. How do I do this on UXSE?
Features of a Good Point of sale device app UI

What should be the guiding factors I should consider when designing a POS app for phones and tablets..Transactions have to be fast and seamless.