Followed @Rich answer, I used view=FitH in my code to view PDF content base64 in Angular as below.
I shared for whom concern about view base64 content PDF file with object tag using Angular framework.
The option for view PDF
this.pdfContent =
      URL.createObjectURL(this.b64toBlob(content, 'application/pdf')) +
      '#toolbar=0&navpanes=0&scrollbar=0&view=FitH';
Read PDF content from API as
let content = DataHelper.getDataFromAPI();
When click show content button use
showData() {
    let content = DataHelper.getDataFromAPI();
    this.pdfContent =
      URL.createObjectURL(this.b64toBlob(content, 'application/pdf')) +
      '#toolbar=0&navpanes=0&scrollbar=0&view=FitH';
    this.pdfview.nativeElement.setAttribute('data', this.pdfContent);
  }
In HTML file use object tag as
<object #pdfview
[data]=''
type="application/pdf"
width="100%"
height="800px"
>
</object>
Link Angular demo https://stackblitz.com/edit/angular-ivy-tdmieb