Hi everyone,
I am being looking for a solution for my requirement but I have not found it for my queries which are as follows:
1:
I have created a Additional details form (which every user has to fill in when they login to the application {if they have not filled it}) which is:

And to save this details I have created a SharePoint list named AdditionalDetails (in Power apps it is named AdditionalDetails_1 after connecting it with my application)
Now once user fills the details they are navigated to Home page where in I have a provided a button to see the additional details that they have filled. I want to display the additional details of the user who is logged in
So for example: I have a LoginList (which stores all the credentials of all users for the app)
Lets say: Jimmy is a user in the List, so now if I login using Jimmy's credentials (Username: jim Pass: 1234) -> Fill the additional details form -> Submit it and Go to Home Page -> Navigate to Additional Details page: In this page I just want to show Jimmy's additional no other records (no blank values as well) {it should filter out based on Login List user credentials not by Office365 account details}
AdditionalDetails (Share Point list):

Login List:
Header:


So I did try using Lookup function (inside ForAll) and tried comparing the Email field from the SharePoint List (AdditionalDetails_1) with the sharepoint list LoginList to check Email from both is matching for current logged user, but I was not getting the expected result:


As you can see in the above 2 images: I have logged in using Test user credentials (where the additional details are already filled in) but here I am able to see all additional details of other users as well and some blank rows

To compare the values from 2 different sharepoint list (here I email) I have used '@' , through one post I came across:
Reference to check a value in two different sharepoint list
Logic on the Gallery on ViewAdditional Details page. I did try using RemoveIf but that's not allowed (had referred: https://powerusers.microsoft.com/t5/Building-Power-Apps/How-do-I-delete-empty-rows-in-a-table-collection/m-p/2076143#M519134) - it might be for collection.
Can anyone please help with this. I have created a detailed query for the same (the actual requirement that I have: 60% percent is completed, now only the last step is remaining) and this query is subset of the main query:
Main Query: Additional Details
Also I have some queries that I have posted on Forum (for which I need answers as well), so do have a look at those as well, I have mentioned the links below:
1. Block User after few incorrect attempts
2. Editing the Gallery on the go
If you guys have time do check and reply: @WarrenBelz @KeithAtherton , @Ramole , @timl
Regards,
Sidhant