scatter transparency

very important feature. microsoft please make it happen

Agreed, extremely important! Cannot believe this does not already exist.

More specifically, when clicking legend items, the transparency of the unselected items is insufficient - it's very hard to tell what was selected in a large set. This should be configurable (seems to default to around 40% transparent, I would want closer to 80 or 90).

Yes... I would like to add my voice to this request... I posted in the forum's and I just don't think it is possible (see here for further details: https://community.powerbi.com/t5/Desktop/Increase-the-fade-of-the-when-Highlighting-via-Filter/m-p/647095#M310221 )

As a workaround you can use conditional formatting apply a gradient. I found this by accident after finding this answer. Under Visualizations > Format, expand Data colors click the hamburger menu next to color and choose Conditional Formatting.

This would be so use full to solve overlay issues. Same applies to a standard jitter setting.

very important feature

'Rather embarrassing this easily added transparency is not included. Since 2016! Data is obscured (turning off Fill Points helps but is not enough) so the presentation is laughable compared to other BI/Charting tools. Conditional Formatting has been removed from it too - https://community.powerbi.com/t5/Desktop/Conditional-Formatting-Scatter-Chart/m-p/782858/highlight/false#M377073 The legend click silhouetting is ahead of the other tools, but this cripples that goodness. Please get this sorted (jitter ideal too) so we can present proper scatter / point charts.