Have you checked these first?
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osTicket v1.15.2 // osTicket-1.15.1-Awesome-102
PHP 7.4.16 // MySQL 5.7.31 // Apache web server
The search bar on the right side of the navigation row is invisible (you can see the blue magnifier icon, but not the input field or the placeholder):

The search bar should be visible when the bar is themed to be white or some other light colour.
Can you advise on a fix?
Thanks!
Miklos
Add the following code to Admin Panel > Theme > Custom CSS.
The first group is the search field as it displays when inactive.
The second group is when it is in focus.
background-color and border-color should be self-explanatory. color refers to the color of any text that is entered by the user.
Adjust the colors as you see fit.
form[action="kb.php"] #basic_search .input.attached input, form[action="orgs.php"] .input.attached input, form[action="users.php"] .input.attached input, form[action="tasks.php"] .input.attached input, form[action="tickets.php"] .input.attached input {
background-color: #ddd;
}
form[action="kb.php"] #basic_search .input.attached input:focus,
form[action="orgs.php"] .input.attached input:focus,
form[action="users.php"] .input.attached input:focus,
form[action="tasks.php"] .input.attached input:focus,
form[action="tickets.php"] .input.attached input:focus {
background-color: #ccc;
border-color: #eee;
color: #000;
}
Thanks, this worked!