I had similar problems with an application used by a workforce with a good proportion for 50 years.
I learned the amazing amount by just sitting with them when they used the app. If they tried to do something that I thought was stupid or missed what I thought was obvious, I would ask them what they tried to do and what made them think that this was the way to solve the problem.
This is very true, many of the things that more experienced users think are benefits, and useful features can just be distracting. Remember to carefully review user reviews. If you also have advanced users, they may have an advanced mode, including auto-complete, etc. But never try to think that you know better, because a certain way of working allows you to work more efficiently when you use the user interface.
Besides. Remember to use large, simple fonts, contrasting and large buttons that are easy to apply with the mouse. I know that you say that you have no problems with accessibility, but your users can appreciate these things and see this as an improvement in the user interface. One of the problems was that users did not seem to understand the meaning of the icons, the text seemed to work better. Or, if you have space, include text next to existing icons.
Be very careful when you start adding new features ... they can confuse this user in droves. It took them a long time to figure out how to do something, and now they have changed it! Thus, new features do not upset the old too much, or at all, if possible.
Another good thing to consider is the workflow. If you can arrange screen elements so that users can work from top to bottom in a linear way to achieve the task, this can improve usability.
Scott langham
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