Should you always confirm sign-out in a mobile app?

Is this necessary as it’s not a critical action but I see it in a few apps. If so, what are the reasons behind it?
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What’s the recommended max width for the main container and for the main column, for large screens?

Based on this question, “Why do many sites leave half of each webpage empty?” and its comments and answers, I did some research, but I didn’t find a complete answer.
For me it is obvious that it is a good decision to limit the width of t…
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Fixed width for buttons or proportional with the text?

What is the best practice for a UI, to make all the similar buttons with a fixed-width, no matter how long is the text (with the condition to fit) or make the width proportional with the text and add the same padding?
Update:
Please check…
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Form navigation mental model

If an user comes from Windows based software, where in forms you navigate through the inputs with enter key and save by ctrl+s, to browser based software where the default navigation is done with the tab key and save with enter, what can I…
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Is it a "Natural language" form a good practice?

A good UX for a form is one that makes it easy and fast to use.
An experimental form like this, that uses natural language instead of the usual form display seems to be simple to use and creative, but is this enough intuitive?
Update:
Af…
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Which is faster to fill-out: Paper or digital forms? [closed]
![Which is faster to fill-out: Paper or digital forms? [closed]](https://uxsharelab.com/wp-content/themes/proxima/images/thumbnail-placeholder.gif)
We are wondering which of the two are faster to fill out for walk-in customers who wants to sign-up for a class.
PAPER:
Pros:
Forms can be distributed to many customers and they can fill this out simultaneously.
Cons:
What’s written on …
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Request invite to closed web app – what information to ask for?

Our site is a closed service where users request an invitation to access the site. We are primarily looking for producers and makers to join to share information about their products, stories & track the supply chain of their products…
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Taking users from Offer’s T&C page to Listing or Details page?

Case:
In my e-commerce website/mobile-site/mobile-app, we run offers that are shown on PDP (Product Details page). These offers are a bit complicated and hence a detailed T&C page has been created to explain all the details around the …
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Describing 3D swiping hand movement as curve on a XY plane

I’m trying to describe a 3D swipe gesture (only vertical or horizontal, no diagonals) above a given flat surface using as much conventional geometry or similar non-machine-learning techniques (Hidden Markov model, artificial neural network…
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Showing item-level & order-level offers/promotions on Details page (PDP) &/or Cart page?

I have 2 types of offers (promotions) applicable on my eCommerce website:
Item level offers (example: Item belongs to Brand XYZ. Buy any 2 items from brand XYZ to get 30% off)
Order level offers (example: $10 off on total purchase of $10…