Hi, Anna 

Thanks for reaching out to us

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1.

You are correct about the first question.

At this time, this is unfortunately not achievable with any of the functionalities in our plugin.

Please feel free to search on our suggestions page, 

 to see if someone may be already suggested this feature. If you can't see it, feel free to add your suggestion there,  and as more people vote, the feature will move higher on the priority list.

You can certainly follow our changeLog page if you'd like ( it is also available in the plugin dashboard), where we state any changes/new features/bug fixes during updates;

and our newsletter, so you're informed about new features, bug fixes, freebies, etc.

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At this time ,we can hide the table with Powerful filters "hide table" feature;

 then a user would have to make certain filter selections, before the table loads;

but each column can only filter its own values - we can not hide column Y based on column X filter selection.

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For example, on this Documentation we made a classic example of filtering prices depending on the country selected;

If someone selects country "Italy", it is just going to filter the price for that country, like this:

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But if you need to hide entire columns, based on filter selection, that is currently not possible. Perhaps in the future, we will work to add a possibility.

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2.

If you need to change any styles of a column contents, you can set a conditional , to add a CSS custom class, if a condition is met.

On my example, i will say, if number equals 1, set CSS class of "classGreeen".

Then, if i want to change text color only in the cells that match the condition, this is the CSS i add to the table in Customize tab:

Basically, after this "td"  which selects the table data in a row;  we add the CSS class and set the text color:

tbody > tr > td.classGreen{
    color:blue !important;
}

I set it first to green, but it was not very visible, compared to this black color of other text, so changed it to blue, just to see the difference.

- Let me know if that helps.

3.

Not sure if i understood this one.

If you wish to have separate styling of the filter section, best will be to separate them , and set above table, with this selection:

Then we can use various CSS selectors, depending what you need to style.

For example, this selector :

.wpDataTablesFilter .wpDataTableFilterSection:not(#wdt-clear-filters-button-block):not(#wdt-pf-search-filters-button-block) {
    float: left;
    margin-bottom: 10px;
    margin-right: 15px;
    width: 230px;
    min-height: 115px;
}

Here you can change some styles, and add new properties as you need.

This is selecting all the HTML Divs that hold individual filter boxes;

.wpDataTablesFilter .wpDataTableFilterSection#wdt-clear-filters-button-block {
    display: inline-block;
    margin-bottom: 0px;
    padding-top: 42px;
}

That one is for the "clear filters" DIV.

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Let me know if that helped, and if you have any questions. Thank you