@sanjeev543 before answering the question I would want to know the reason for turning responsive UI width into fixed?
Whatever be your justification, if the panel id with inputs where you need to fix the panel width is panel_fixed_inputs you can try the following CSS for turning panel width from 100% (responsive to static) i.e.
#panel_fixed_inputs{
width: 1480px !important;
}
Following is the complete run anywhere dashboard example
<form>
<label>Dashboard with fixed inputs</label>
<fieldset submitButton="false"></fieldset>
<row depends="$alwaysHideCssStyle$">
<panel>
<html>
<style>
#panel_fixed_inputs{
width: 1495px !important;
}
</style>
</html>
</panel>
</row>
<row>
<panel id="panel_fixed_inputs">
<title>Panel with Fixed Width through CSS Override</title>
<input type="dropdown" token="field1">
<label>field1</label>
</input>
<input type="dropdown" token="field4">
<label>field4</label>
</input>
<input type="multiselect" token="field3">
<label>field3</label>
</input>
<input type="multiselect" token="field5">
<label>field5</label>
</input>
<input type="text" token="field2">
<label>field2</label>
</input>
<input type="text" token="field6">
<label>field6</label>
</input>
</panel>
</row>
<row>
<panel id="panel_responsive_inputs">
<title>Panel with responsive width</title>
<input type="dropdown" token="field01">
<label>field01</label>
</input>
<input type="dropdown" token="field04">
<label>field04</label>
</input>
<input type="multiselect" token="field03">
<label>field03</label>
</input>
<input type="multiselect" token="field05">
<label>field05</label>
</input>
<input type="text" token="field02">
<label>field02</label>
</input>
<input type="text" token="field06">
<label>field06</label>
</input>
</panel>
</row>
</form>
