Override getMeta function in your dataprovider and set value like this.
my form.xml
<fieldset name="fieldset_name">
<field name="attribute_id">
<argument name="data" xsi:type="array">
<item name="options" xsi:type="object">Vendor\Module\Model\Source\Attributes</item>
<item name="config" xsi:type="array">
<item name="dataType" xsi:type="string">text</item>
<item name="formElement" xsi:type="string">select</item>
<item name="label" xsi:type="string" translate="true">Attribute</item>
<item name="component" xsi:type="string">Vendor_Module/js/form/element/select-option</item>
<item name="dataScope" xsi:type="string">attribute_id</item>
<item name="componentType" xsi:type="string">select</item>
<item name="validation" xsi:type="array">
<item name="required-entry" xsi:type="boolean">true</item>
</item>
</item>
</argument>
</field>
</fieldset>
My DataProvide.
public function getMeta()
{
$meta = parent::getMeta();
$id = $this->request->getParam('id');
if(<<Your Condition>>){
$meta['fieldset_name']['children']['attribute_id']['arguments']['data']['config']['disabled'] = 1;
}
return $meta;
}
I have disable form field using this. It's work fine. you can try.
If you still any query let me know.