Thank you, it's working !
I finally understand that field can be used to define a function too haha. 
I tried to attribute something to first-search-filter but didn't understand 
how it's worked.
Thank to your simple and easy explanation, I finally made it.

Have a nice day 
Le mardi 10 janvier 2023 à 14:03:59 UTC+1, springer a écrit :

> Try this. (It may not be the most elegant, in terms of coding, but it's an 
> easy and safe tweak to do.)
>
> Using Advanced Search, find the system tiddler with this 
> title: $:/core/ui/DefaultSearchResultList
>
> Make a copy (clone) of it, changing the title at the end to something 
> you'll recognize. (That way, you're not directly over-writing the default 
> version.)
>
> In the cloned copy, don't touch the main text body at all. Just change 
> three fields (ignoring back-tick marks, if they show up for you):
>
> `first-search-filter` edit to 
> `[!is[system]!has[parent]search:title<userInput>sort[title]limit[250]]`
> `second-search-filter` edit to 
> `[!is[system]!has[parent]search<userInput>sort[title]limit[250]]`
> `caption` edit to `top-level` (or whatever you like, to clarify the 
> doesn't-have-parent concept)
>
> What these edits do is just to add the string `!has[parent]` within the 
> search filters, to exclude tiddlers with content in the parent field.
>
> One last step, with that system tiddler in view mode, is to click on the 
> $:/tags/SearchResults tag-pill to get the dropdown of search-result 
> templates, and rearrange the order of the search result types, so that the 
> new custom search you prefer is listed at top.
>
> Come back if any of that does not seem straightforward!
>
> -Springer
> On Sunday, January 8, 2023 at 4:22:05 PM UTC-5 [email protected] 
> wrote:
>
>>
>> Sorry I should've have say that I have little to no background in 
>> informatic or coding. I already searched on my own on the official 
>> tiddlywiki (and saw the link listed here) and searched online if someone 
>> has a problem similar to mine.
>> I kind of understand what is explained in the official wiki but not 
>> enough to know where to put the condition.
>> My actual capabilities are limited to finding a problem similar to mine 
>> and just tweak it enough to match what I intend to do right now 
>> Le samedi 7 janvier 2023 à 17:13:19 UTC+1, Télumire a écrit :
>>
>>> See https://tiddlywiki.com/#Customising%20search%20results
>>>
>>> On Saturday, 7 January 2023 at 16:48:41 UTC+1 [email protected] 
>>> wrote:
>>>
>>>> Hello everybody,
>>>>
>>>> I'm using the plugin "Streams" for one of my tiddlywiki.
>>>> For now, the only but big downside is that the standard search bar is 
>>>> useless as I have a lot of tiddlers with more or less the same name.
>>>> I just want to search for the original tiddler who has no field name 
>>>> parent in it.
>>>> So I'm currently searching how to add a "!has[parent]" filter on the 
>>>> standard search bar but frankly, I'm stuck on which shadow tiddler I need 
>>>> to modify.
>>>>
>>>> Can you help me ?
>>>>
>>>> Thank you !
>>>>
>>>>
>>>>

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